Initial Commit

packages/api-stack/api/api-secrets-bun/README.md

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+# @suaveplan/api-secrets-bun — SecretsLike adapter backed by Bun.secrets (macOS Keychain / Linux libsecret / Windows Credential Manager). Per-plugin allowlist enforcement, locked-keystore detection, idempotent dispose, OTel api.secrets.reads_total{backend="bun"} counter.
+
+Stage-8 `SecretsLike` adapter backed by `Bun.secrets` (macOS Keychain,
+Linux libsecret, Windows Credential Manager) with per-plugin allow-list
+enforcement, OS-keystore failure-mode classification, and an idempotent
+lifecycle.
+
+The right default for local-dev and single-host operator setups: secrets
+never touch disk in plaintext and rotate via the OS UI.
+
+Per-plugin allow-list keeps each plugin scoped to its manifest-declared
+secrets — a leaked plugin cannot enumerate or read any keystore entry
+beyond what its `manifest.secrets[]` declared. Values never appear in
+logs or errors — only names.
+
+<!-- begin:auto-docs -->
+## Documentation tree
+
+- [adapter](./src/adapter/adapter.md) — The adapter module builds a concrete `SecretsLike` over the `Bun.secrets` API — the cross-platform wrapper Bun ships ar…
+  - [adapter](./src/adapter/adapter.md) — The adapter module builds a concrete `SecretsLike` over the `Bun.secrets` API — the cross-platform wrapper Bun ships ar…
+- [allowlist](./src/allowlist/allowlist.md) — The allow-list module encapsulates the per-plugin scoping rule that defines the package's security boundary: a plugin c…
+  - [allowlist](./src/allowlist/allowlist.md) — The allow-list module encapsulates the per-plugin scoping rule that defines the package's security boundary: a plugin c…
+- [descriptor-builder](./src/descriptor-builder/descriptor-builder.md) — This module produces the `SecretDescriptor[]` shape the plugin manifest emits in its `secrets[]` block from a compact a…
+  - [descriptor-builder](./src/descriptor-builder/descriptor-builder.md) — This module produces the `SecretDescriptor[]` shape the plugin manifest emits in its `secrets[]` block from a compact a…
+- [error-codes](./src/error-codes/error-codes.md) — This module owns the stable `SECRETS_BUN.*` code registry and the `SecretsBunError` subclass thrown by every failure pa…
+  - [error-codes](./src/error-codes/error-codes.md) — This module owns the stable `SECRETS_BUN.*` code registry and the `SecretsBunError` subclass thrown by every failure pa…
+- [otel](./src/otel/instruments.md) — This module owns the OpenTelemetry instrument bundle the `Bun.secrets`-backed adapter emits and a lazy cache that re-bi…
+  - [instruments](./src/otel/instruments.md) — This module owns the OpenTelemetry instrument bundle the `Bun.secrets`-backed adapter emits and a lazy cache that re-bi…
+<!-- end:auto-docs -->
+
+## Install
+
+```bash
+bun add @suaveplan/api-secrets-bun
+```
+
+## Usage
+
+```ts
+import { createBunSecretsAdapter } from "@suaveplan/api-secrets-bun";
+
+const adapter = createBunSecretsAdapter({
+    service: "billing-plugin",
+    allowlist: ["STRIPE_SECRET_KEY", "JWT_SIGNING_KEY"],
+});
+
+const key = await adapter.secrets.require("STRIPE_SECRET_KEY");
+```
+
+### Manifest-driven allow-list
+
+The companion `buildBunSecretDescriptors` builder lets a plugin derive
+its `manifest.secrets[]` and the adapter's `allowlist` from a single
+declaration so they cannot drift:
+
+```ts
+import {
+    buildBunSecretDescriptors,
+    descriptorAllowlist,
+    createBunSecretsAdapter,
+} from "@suaveplan/api-secrets-bun";
+
+const descriptors = buildBunSecretDescriptors([
+    "STRIPE_SECRET_KEY",
+    { name: "OPTIONAL_WEBHOOK_KEY", required: false },
+]);
+
+const adapter = createBunSecretsAdapter({
+    service: "billing-plugin",
+    allowlist: descriptorAllowlist(descriptors),
+});
+
+// `descriptors` goes on the plugin manifest's `secrets[]`.
+```
+
+## Capability
+
+This package declares `secrets.bun`. Plugins that specifically require
+the Bun keystore (e.g. desktop runtimes that bundle Bun) can pin the
+backend in `requiredCapabilities`; otherwise the host's `host.secrets.backend`
+config selects this adapter alongside the abstract `secrets` capability.
+
+## Failure modes
+
+Distinguishes:
+
+- `SECRETS_BUN.NOT_FOUND` — permitted name; OS keystore returned `null`.
+  `get()` resolves to `undefined`; `require()` throws.
+- `SECRETS_BUN.NOT_ALLOWED` — name not in the plugin's allow-list.
+  Raised BEFORE any keystore round-trip.
+- `SECRETS_BUN.KEYSTORE_LOCKED` — OS keystore is locked. The adapter
+  does NOT fall back silently — operator must unlock.
+- `SECRETS_BUN.KEYSTORE_UNAVAILABLE` — `Bun.secrets` is missing
+  (running under Node without the shim), the OS keystore daemon is not
+  running, or the adapter has been `dispose()`d.
+- `SECRETS_BUN.WRITE_FAILED` — `set`/`delete` failed at the OS layer.
+  Always wraps the underlying error as `cause`.
+- `SECRETS_BUN.INVALID_OPTIONS` — adapter construction failed Zod
+  validation.
+
+## OpenTelemetry
+
+Emits:
+
+- `api.secrets.reads_total{backend="bun"}` — successful reads.
+- `api.secrets.not_found_total{backend="bun"}` — permitted-but-absent.
+- `api.secrets.denied_total{backend="bun"}` — allow-list rejections.
+
+Metric names are backend-agnostic so dashboards roll up across every
+`api.secrets.*` source via the `backend` label.
+
+## Lifecycle
+
+`adapter.dispose()` is idempotent — repeat calls are no-ops. Post-dispose
+reads / writes throw `KEYSTORE_UNAVAILABLE` rather than leaking the
+keystore reference.
+
+## Conformance
+
+Passes `runSecretsConformance` from `@suaveplan/api-secrets/testing`
+unchanged — see `src/adapter/adapter.spec-conformance.test.ts`.
+
+## Modules
+
+| Module | Subpath | Purpose |
+| --- | --- | --- |
+| `adapter` | `./adapter` | `createBunSecretsAdapter` factory + types. |
+| `allowlist` | `./allowlist` | Per-plugin allow-list with `assertAllowed`. |
+| `descriptor-builder` | `./descriptor-builder` | Compact → `SecretDescriptor[]`. |
+| `error-codes` | `./error-codes` | `SECRETS_BUN.*` registry + `SecretsBunError`. |
+| `otel` | `./otel` | OTel instruments + reset hook. |
+
+## License
+
+MIT
+

packages/api-stack/api/api-secrets-bun/package.json

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+{
+    "name": "@suaveplan/api-secrets-bun",
+    "version": "0.1.0",
+    "type": "module",
+    "sideEffects": false,
+    "description": "Stage-8 SecretsLike adapter backed by Bun.secrets (macOS Keychain / Linux libsecret / Windows Credential Manager). Per-plugin allowlist enforcement, locked-keystore detection, idempotent dispose, OTel api.secrets.reads_total{backend=\"bun\"} counter.",
+    "license": "MIT",
+    "author": "Suaveplan Team",
+    "main": "./dist/index.js",
+    "module": "./dist/index.js",
+    "types": "./dist/index.d.ts",
+    "exports": {
+        "./package.json": "./package.json",
+        ".": {
+            "import": {
+                "types": "./dist/index.d.ts",
+                "default": "./dist/index.js"
+            }
+        },
+        "./adapter": {
+            "import": {
+                "types": "./dist/adapter/adapter.d.ts",
+                "default": "./dist/adapter/adapter.js"
+            }
+        },
+        "./allowlist": {
+            "import": {
+                "types": "./dist/allowlist/allowlist.d.ts",
+                "default": "./dist/allowlist/allowlist.js"
+            }
+        },
+        "./descriptor-builder": {
+            "import": {
+                "types": "./dist/descriptor-builder/descriptor-builder.d.ts",
+                "default": "./dist/descriptor-builder/descriptor-builder.js"
+            }
+        },
+        "./error-codes": {
+            "import": {
+                "types": "./dist/error-codes/error-codes.d.ts",
+                "default": "./dist/error-codes/error-codes.js"
+            }
+        },
+        "./otel": {
+            "import": {
+                "types": "./dist/otel/instruments.d.ts",
+                "default": "./dist/otel/instruments.js"
+            }
+        }
+    },
+    "scripts": {
+        "build": "vite build",
+        "test": "vitest run",
+        "test:watch": "vitest",
+        "test:coverage": "vitest run --coverage",
+        "lint": "bunx biome check src/ tests/",
+        "lint:fix": "bunx biome lint --fix --unsafe --max-diagnostics 500 src/ tests/",
+        "format": "bunx biome format --write --max-diagnostics 500 src/ tests/",
+        "check": "bunx biome check --write --unsafe --max-diagnostics 500 src/ tests/",
+        "typecheck": "bunx tsc --noEmit --composite false -p tsconfig.lib.json",
+        "docs:check": "bun run ../../../../scripts/docs-check.ts ."
+    },
+    "dependencies": {
+        "@opentelemetry/api": "catalog:observability",
+        "@suaveplan/api-secrets": "workspace:^",
+        "@suaveplan/api-types": "workspace:^",
+        "@suaveplan/error": "workspace:^",
+        "tslib": "catalog:build",
+        "zod": "catalog:forms"
+    },
+    "devDependencies": {
+        "@opentelemetry/sdk-metrics": "1.30.0",
+        "@suaveplan/testing": "workspace:^",
+        "@types/node": "catalog:",
+        "@vitest/coverage-istanbul": "catalog:testing",
+        "typescript": "catalog:",
+        "vite": "catalog:build",
+        "vite-plugin-dts": "catalog:build",
+        "vitest": "catalog:testing"
+    },
+    "publishConfig": {
+        "registry": "https://npmjs.fq.io/",
+        "access": "public"
+    },
+    "files": [
+        "dist",
+        "src",
+        "README.md"
+    ]
+}

packages/api-stack/api/api-secrets-bun/src/adapter/adapter.md

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+# `adapter`
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+The adapter module builds a concrete `SecretsLike` over the
+`Bun.secrets` API — the cross-platform wrapper Bun ships around the OS
+keystore (macOS Keychain, Linux libsecret, Windows Credential Manager).
+The host installs the returned `secrets` handle as `ctx.secrets` so
+plugins read manifest-declared secrets through the same surface every
+other backend exposes; the only difference is values live in the OS
+keystore rather than `process.env`, a remote vault, or a worker proxy.
+
+The adapter also exposes adapter-specific `set` / `deleteSecret`
+helpers that the abstract `SecretsLike` does not need but are essential
+for the operator UX of rotating a secret without dropping out to the
+OS UI. Both helpers go through the same allow-list gate as `get` so a
+plugin cannot write outside its manifest.
+
+## Features
+
+- Per-plugin allow-list gates every `get` / `require` / `set` /
+  `deleteSecret` BEFORE the keystore round-trip.
+- Distinguishes `NOT_FOUND` (`null` from `Bun.secrets.get`) from
+  `KEYSTORE_LOCKED` and `KEYSTORE_UNAVAILABLE` via a classifier that
+  inspects `error.code` first then falls back to message substrings.
+- Idempotent `dispose()` for lifecycle dedup; post-dispose reads /
+  writes throw `KEYSTORE_UNAVAILABLE`.
+- Emits `api.secrets.reads_total{backend="bun"}` on every successful
+  resolve, `api.secrets.not_found_total{backend="bun"}` on every
+  permitted-but-absent read, and `api.secrets.denied_total{backend="bun"}`
+  on every allow-list rejection.
+- Injectable `keystore` and `classifyError` so tests run against an
+  in-memory keystore on Node without touching the real OS daemon.
+- Zod-validated options — empty `service` / empty `allowlist` / empty
+  names all raise `SECRETS_BUN.INVALID_OPTIONS` at construction.
+
+## Usage: Basic
+
+```ts
+import { createBunSecretsAdapter } from "@suaveplan/api-secrets-bun/adapter";
+
+const adapter = createBunSecretsAdapter({
+    service: "my-plugin",
+    allowlist: ["STRIPE_SECRET_KEY", "JWT_SIGNING_KEY"],
+});
+
+const key = await adapter.secrets.require("STRIPE_SECRET_KEY");
+```
+
+## Usage: Advanced
+
+Inject a custom keystore (test harness) and a bespoke classifier (e.g.
+when wrapping a third-party keystore CLI whose error codes do not match
+Bun's convention):
+
+```ts
+import {
+    createBunSecretsAdapter,
+    type BunSecretsKeystore,
+} from "@suaveplan/api-secrets-bun/adapter";
+
+const memory: BunSecretsKeystore = {
+    /* ... in-memory get / set / delete ... */
+};
+
+const adapter = createBunSecretsAdapter({
+    service: "my-plugin",
+    allowlist: ["A"],
+    keystore: memory,
+    classifyError: (err) =>
+        typeof err === "object" && err !== null && "stderr" in err &&
+        String((err as { stderr: unknown }).stderr).includes("locked")
+            ? "KEYSTORE_LOCKED"
+            : undefined,
+});
+
+await adapter.set("A", "v");
+const v = await adapter.secrets.require("A");
+
+// Lifecycle: dispose once at plugin teardown.
+adapter.dispose();
+```
+
+## API Reference
+
+- `createBunSecretsAdapter(options): BunSecretsAdapter` — entry point.
+- `BunSecretsAdapter.secrets: SecretsLike` — read-only handle the host
+  installs as `ctx.secrets`.
+- `BunSecretsAdapter.set(name, value): Promise<void>` — adapter-specific
+  write through the allow-list and keystore.
+- `BunSecretsAdapter.deleteSecret(name): Promise<void>` — adapter-specific
+  delete.
+- `BunSecretsAdapter.dispose(): void` — idempotent lifecycle teardown.
+- `BunSecretsKeystore` — structural view of `Bun.secrets`.
+- `defaultClassifyError(err): "KEYSTORE_LOCKED" | "KEYSTORE_UNAVAILABLE" | undefined` —
+  default failure-mode classifier.
+
+## Implementation Notes
+
+The default keystore probe reads `globalThis.Bun.secrets` rather than
+importing the `Bun` global directly, so the package typechecks under
+plain Node when `@types/bun` is absent. When the probe returns
+`undefined` (Node, or a Bun runtime missing the `secrets` namespace),
+the constructor throws `KEYSTORE_UNAVAILABLE` so a misconfigured host
+fails loudly at start rather than at first read.
+
+`api.secrets.reads_total` is incremented from inside `get` / `require`
+on the success path only, AFTER the keystore returns a non-`null` value.
+This pins the metric to actual reads rather than attempts so dashboards
+graphing read pressure are not contaminated by allow-list rejections
+(those live on `denied_total`) or missing entries (those live on
+`not_found_total`).
+
+The `dispose` flag is checked first inside every public call so a
+disposed adapter cannot leak a stale keystore reference; it is also
+idempotent so the host can call it from both a `SIGTERM` handler and a
+plugin-unload hook without crashing.

packages/api-stack/api/api-secrets-bun/src/adapter/adapter.spec-conformance.test.ts

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+// NOTE: import from source not dist — api-secrets's dist bundles vitest
+// internals (pre-existing build-config bug; tracked upstream). Source
+// import goes through workspace TS resolution and uses our local vitest.
+import { runSecretsConformance } from "../../../api-secrets/src/testing/conformance.js";
+import {
+    SECRETS_BUN_CODES,
+    type SecretsBunError,
+} from "../error-codes/error-codes.js";
+import { type BunSecretsKeystore, createBunSecretsAdapter } from "./adapter.js";
+
+function inMemoryKeystore(): BunSecretsKeystore {
+    const store = new Map<string, string>();
+    return {
+        async get({ service, name }) {
+            return store.get(`${service}:${name}`) ?? null;
+        },
+        async set({ service, name, value }) {
+            store.set(`${service}:${name}`, value);
+        },
+        async delete({ service, name }) {
+            store.delete(`${service}:${name}`);
+        },
+    };
+}
+
+runSecretsConformance({
+    label: "bun",
+    factory: async (seed) => {
+        const keystore = inMemoryKeystore();
+        const seededNames = Object.keys(seed);
+        // The harness's "MISSING" probe routes through the NOT_FOUND path
+        // rather than NOT_ALLOWED — allow it explicitly.
+        const allowlist =
+            seededNames.length === 0
+                ? ["MISSING"]
+                : [...seededNames, "MISSING"];
+        const adapter = createBunSecretsAdapter({
+            service: "conformance",
+            allowlist,
+            keystore,
+        });
+        for (const [k, v] of Object.entries(seed)) {
+            await adapter.set(k, v);
+        }
+        return {
+            secrets: {
+                get: (name) => adapter.secrets.get(name),
+                require: (name) => adapter.secrets.require(name),
+                // The harness verifies `list()` returns exactly the seeded
+                // names. Strip the "MISSING" probe added for NOT_FOUND
+                // routing unless the seed itself contained it.
+                list: () =>
+                    adapter.secrets
+                        .list()
+                        .filter((n) => n !== "MISSING" || n in seed),
+            },
+            teardown: () => {
+                adapter.dispose();
+            },
+        };
+    },
+    isNotFound: (err) =>
+        typeof err === "object" &&
+        err !== null &&
+        "code" in err &&
+        (err as SecretsBunError).code === SECRETS_BUN_CODES.NOT_FOUND,
+});

packages/api-stack/api/api-secrets-bun/src/adapter/adapter.test.ts

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+import { metrics } from "@opentelemetry/api";
+import {
+    AggregationTemporality,
+    InMemoryMetricExporter,
+    MeterProvider,
+    PeriodicExportingMetricReader,
+} from "@opentelemetry/sdk-metrics";
+import {
+    afterEach,
+    beforeEach,
+    describe,
+    expect,
+    it,
+} from "@suaveplan/testing/runner";
+import {
+    SECRETS_BUN_CODES,
+    SecretsBunError,
+} from "../error-codes/error-codes.js";
+import { resetSecretsBunInstruments } from "../otel/instruments.js";
+import {
+    __setBunGlobalProbeForTest,
+    type BunSecretsKeystore,
+    createBunSecretsAdapter,
+    defaultClassifyError,
+} from "./adapter.js";
+
+function inMemoryKeystore(
+    initial: Record<string, string> = {}
+): BunSecretsKeystore & { store: Map<string, string> } {
+    const store = new Map<string, string>(Object.entries(initial));
+    return {
+        store,
+        async get({ service, name }) {
+            return store.get(`${service}:${name}`) ?? null;
+        },
+        async set({ service, name, value }) {
+            store.set(`${service}:${name}`, value);
+        },
+        async delete({ service, name }) {
+            store.delete(`${service}:${name}`);
+        },
+    };
+}
+
+function throwingKeystore(err: unknown): BunSecretsKeystore {
+    return {
+        async get() {
+            throw err;
+        },
+        async set() {
+            throw err;
+        },
+        async delete() {
+            throw err;
+        },
+    };
+}
+
+let exporter: InMemoryMetricExporter;
+let provider: MeterProvider;
+
+beforeEach(() => {
+    metrics.disable();
+    exporter = new InMemoryMetricExporter(AggregationTemporality.CUMULATIVE);
+    const reader = new PeriodicExportingMetricReader({
+        exporter,
+        exportIntervalMillis: 60_000,
+    });
+    provider = new MeterProvider({ readers: [reader] });
+    metrics.setGlobalMeterProvider(provider);
+    resetSecretsBunInstruments();
+});
+
+afterEach(async () => {
+    await provider.forceFlush();
+    metrics.disable();
+    resetSecretsBunInstruments();
+});
+
+async function readsTotal(): Promise<number> {
+    await provider.forceFlush();
+    let total = 0;
+    for (const rm of exporter.getMetrics()) {
+        for (const sm of rm.scopeMetrics) {
+            for (const m of sm.metrics) {
+                if (m.descriptor.name !== "api.secrets.reads_total") continue;
+                for (const dp of m.dataPoints) {
+                    total += dp.value as number;
+                }
+            }
+        }
+    }
+    return total;
+}
+
+describe("createBunSecretsAdapter — option validation", () => {
+    it("rejects empty allowlist", { timeout: 5000 }, () => {
+        let caught: unknown;
+        try {
+            createBunSecretsAdapter({
+                service: "plugin",
+                allowlist: [],
+                keystore: inMemoryKeystore(),
+            });
+        } catch (err) {
+            caught = err;
+        }
+        expect(caught).toBeInstanceOf(SecretsBunError);
+        expect((caught as SecretsBunError).code).toBe(
+            SECRETS_BUN_CODES.INVALID_OPTIONS
+        );
+    });
+
+    it("rejects empty service", { timeout: 5000 }, () => {
+        let caught: unknown;
+        try {
+            createBunSecretsAdapter({
+                service: "",
+                allowlist: ["A"],
+                keystore: inMemoryKeystore(),
+            });
+        } catch (err) {
+            caught = err;
+        }
+        expect((caught as SecretsBunError).code).toBe(
+            SECRETS_BUN_CODES.INVALID_OPTIONS
+        );
+    });
+
+    it("rejects empty-string allowlist entry", { timeout: 5000 }, () => {
+        let caught: unknown;
+        try {
+            createBunSecretsAdapter({
+                service: "plugin",
+                allowlist: [""],
+                keystore: inMemoryKeystore(),
+            });
+        } catch (err) {
+            caught = err;
+        }
+        expect((caught as SecretsBunError).code).toBe(
+            SECRETS_BUN_CODES.INVALID_OPTIONS
+        );
+    });
+
+    it("throws KEYSTORE_UNAVAILABLE when globalThis.Bun is undefined", {
+        timeout: 5000,
+    }, () => {
+        try {
+            __setBunGlobalProbeForTest(() => undefined);
+            let caught: unknown;
+            try {
+                createBunSecretsAdapter({ service: "p", allowlist: ["A"] });
+            } catch (err) {
+                caught = err;
+            }
+            expect((caught as SecretsBunError).code).toBe(
+                SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE
+            );
+        } finally {
+            __setBunGlobalProbeForTest(undefined);
+        }
+    });
+
+    it("throws KEYSTORE_UNAVAILABLE when globalThis.Bun is null", {
+        timeout: 5000,
+    }, () => {
+        try {
+            // Probe returns null — typeof null is "object" so the
+            // primary type guard alone would let it through; the `!== null`
+            // arm is the prevention.
+            __setBunGlobalProbeForTest(() => null);
+            let caught: unknown;
+            try {
+                createBunSecretsAdapter({ service: "p", allowlist: ["A"] });
+            } catch (err) {
+                caught = err;
+            }
+            expect((caught as SecretsBunError).code).toBe(
+                SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE
+            );
+        } finally {
+            __setBunGlobalProbeForTest(undefined);
+        }
+    });
+
+    it("throws KEYSTORE_UNAVAILABLE when Bun has no secrets namespace", {
+        timeout: 5000,
+    }, () => {
+        try {
+            __setBunGlobalProbeForTest(() => ({}));
+            let caught: unknown;
+            try {
+                createBunSecretsAdapter({ service: "p", allowlist: ["A"] });
+            } catch (err) {
+                caught = err;
+            }
+            expect((caught as SecretsBunError).code).toBe(
+                SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE
+            );
+        } finally {
+            __setBunGlobalProbeForTest(undefined);
+        }
+    });
+
+    it("exercises the default probe (no override, no keystore supplied)", {
+        timeout: 5000,
+    }, () => {
+        // Ensure the default probe is in effect — restoring is a no-op when
+        // nothing overrode it but pinned here for documentation.
+        __setBunGlobalProbeForTest(undefined);
+        // Under vitest's forked Node pool the Bun global is absent →
+        // the default probe returns undefined → constructor throws.
+        // Under Bun, the global IS present and `secrets` is a real
+        // namespace — supply a keystore explicitly to avoid touching
+        // the real OS keystore.
+        const bunGlobal = (globalThis as { Bun?: { secrets?: unknown } }).Bun;
+        if (bunGlobal?.secrets === undefined) {
+            expect(() =>
+                createBunSecretsAdapter({ service: "p", allowlist: ["A"] })
+            ).toThrowError(/KEYSTORE_UNAVAILABLE/);
+        } else {
+            // Real Bun runtime — confirm the default probe sees the
+            // secrets namespace by constructing the adapter and reading
+            // its allowlist (no keystore round-trip).
+            const a = createBunSecretsAdapter({
+                service: "@suaveplan/api-secrets-bun-default-probe-test",
+                allowlist: ["ZZZ_PROBE_ONLY"],
+            });
+            expect(a.allowlist.has("ZZZ_PROBE_ONLY")).toBe(true);
+        }
+    });
+
+    it("uses globalThis.Bun.secrets when no keystore supplied", {
+        timeout: 5000,
+    }, async () => {
+        const fake = inMemoryKeystore({ "p:A": "fromBun" });
+        try {
+            __setBunGlobalProbeForTest(() => ({ secrets: fake }));
+            const a = createBunSecretsAdapter({
+                service: "p",
+                allowlist: ["A"],
+            });
+            await expect(a.secrets.get("A")).resolves.toBe("fromBun");
+        } finally {
+            __setBunGlobalProbeForTest(undefined);
+        }
+    });
+});
+
+describe("createBunSecretsAdapter — get / require", () => {
+    it("get returns stored value AND increments reads_total", {
+        timeout: 5000,
+    }, async () => {
+        const keystore = inMemoryKeystore({ "p:STRIPE": "sk_live" });
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["STRIPE"],
+            keystore,
+        });
+        await expect(a.secrets.get("STRIPE")).resolves.toBe("sk_live");
+        expect(await readsTotal()).toBe(1);
+    });
+
+    it("get resolves to undefined for permitted-but-absent name", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["STRIPE"],
+            keystore: inMemoryKeystore(),
+        });
+        await expect(a.secrets.get("STRIPE")).resolves.toBeUndefined();
+        expect(await readsTotal()).toBe(0);
+    });
+
+    it("require throws NOT_FOUND for permitted-but-absent name", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["STRIPE"],
+            keystore: inMemoryKeystore(),
+        });
+        await expect(a.secrets.require("STRIPE")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.NOT_FOUND,
+        });
+    });
+
+    it("require returns the stored value", { timeout: 5000 }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: inMemoryKeystore({ "p:A": "v" }),
+        });
+        await expect(a.secrets.require("A")).resolves.toBe("v");
+    });
+
+    it("list returns the frozen allowlist", { timeout: 5000 }, () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A", "B"],
+            keystore: inMemoryKeystore(),
+        });
+        const names = [...a.secrets.list()].sort();
+        expect(names).toEqual(["A", "B"]);
+        expect(Object.isFrozen(a.secrets.list())).toBe(true);
+    });
+});
+
+describe("createBunSecretsAdapter — allow-list", () => {
+    it("get rejects un-manifested name BEFORE keystore round-trip", {
+        timeout: 5000,
+    }, async () => {
+        let getCalls = 0;
+        const keystore: BunSecretsKeystore = {
+            async get() {
+                getCalls += 1;
+                return null;
+            },
+            async set() {},
+            async delete() {},
+        };
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["STRIPE"],
+            keystore,
+        });
+        await expect(a.secrets.get("AWS")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.NOT_ALLOWED,
+        });
+        expect(getCalls).toBe(0);
+    });
+
+    it("require rejects un-manifested name", { timeout: 5000 }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["STRIPE"],
+            keystore: inMemoryKeystore(),
+        });
+        await expect(a.secrets.require("AWS")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.NOT_ALLOWED,
+        });
+    });
+
+    it("set rejects un-manifested name", { timeout: 5000 }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: inMemoryKeystore(),
+        });
+        await expect(a.set("AWS", "v")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.NOT_ALLOWED,
+        });
+    });
+
+    it("deleteSecret rejects un-manifested name", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: inMemoryKeystore(),
+        });
+        await expect(a.deleteSecret("AWS")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.NOT_ALLOWED,
+        });
+    });
+});
+
+describe("createBunSecretsAdapter — keystore failure modes", () => {
+    it("locked keystore raises SECRETS_BUN_KEYSTORE_LOCKED", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore(
+                Object.assign(new Error("keystore is locked"), {
+                    code: "ERR_KEYSTORE_LOCKED",
+                })
+            ),
+        });
+        await expect(a.secrets.get("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_LOCKED,
+        });
+    });
+
+    it("locked classifier from message triggers KEYSTORE_LOCKED", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore(new Error("keystore Locked by user")),
+        });
+        await expect(a.secrets.require("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_LOCKED,
+        });
+    });
+
+    it("daemon-not-running raises KEYSTORE_UNAVAILABLE via code", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore(
+                Object.assign(new Error("nope"), {
+                    code: "ERR_KEYSTORE_UNAVAILABLE",
+                })
+            ),
+        });
+        await expect(a.secrets.get("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+        });
+    });
+
+    it("daemon-not-running raises KEYSTORE_UNAVAILABLE via message", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore(
+                new Error("libsecret daemon not running")
+            ),
+        });
+        await expect(a.secrets.get("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+        });
+    });
+
+    it("unknown failure wraps as WRITE_FAILED", { timeout: 5000 }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore(new Error("acl quota exceeded")),
+        });
+        await expect(a.set("A", "v")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.WRITE_FAILED,
+        });
+    });
+
+    it("non-Error throwables go through the unknown branch", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore("plain string"),
+        });
+        await expect(a.deleteSecret("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.WRITE_FAILED,
+        });
+    });
+
+    it("custom classifyError overrides the default classifier", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: throwingKeystore(new Error("anything")),
+            classifyError: () => "KEYSTORE_LOCKED",
+        });
+        await expect(a.secrets.get("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_LOCKED,
+        });
+    });
+});
+
+describe("createBunSecretsAdapter — set / delete", () => {
+    it("set writes through to the keystore", { timeout: 5000 }, async () => {
+        const keystore = inMemoryKeystore();
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore,
+        });
+        await a.set("A", "v");
+        expect(keystore.store.get("p:A")).toBe("v");
+    });
+
+    it("deleteSecret removes the entry", { timeout: 5000 }, async () => {
+        const keystore = inMemoryKeystore({ "p:A": "v" });
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore,
+        });
+        await a.deleteSecret("A");
+        expect(keystore.store.has("p:A")).toBe(false);
+    });
+});
+
+describe("createBunSecretsAdapter — lifecycle", () => {
+    it("dispose() is idempotent and gates subsequent reads", {
+        timeout: 5000,
+    }, async () => {
+        const a = createBunSecretsAdapter({
+            service: "p",
+            allowlist: ["A"],
+            keystore: inMemoryKeystore({ "p:A": "v" }),
+        });
+        a.dispose();
+        a.dispose(); // second call must not throw
+        await expect(a.secrets.get("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+        });
+        await expect(a.secrets.require("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+        });
+        await expect(a.set("A", "x")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+        });
+        await expect(a.deleteSecret("A")).rejects.toMatchObject({
+            code: SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+        });
+    });
+});
+
+describe("defaultClassifyError", () => {
+    it("returns undefined for non-objects", { timeout: 5000 }, () => {
+        expect(defaultClassifyError(undefined)).toBeUndefined();
+        expect(defaultClassifyError(null)).toBeUndefined();
+        expect(defaultClassifyError(42)).toBeUndefined();
+        expect(defaultClassifyError("locked")).toBeUndefined();
+    });
+
+    it("returns undefined for an unrecognised Error", {
+        timeout: 5000,
+    }, () => {
+        expect(defaultClassifyError(new Error("acl quota"))).toBeUndefined();
+    });
+
+    it("classifies via error.code first", { timeout: 5000 }, () => {
+        expect(
+            defaultClassifyError(
+                Object.assign(new Error("anything"), {
+                    code: "ERR_KEYSTORE_LOCKED",
+                })
+            )
+        ).toBe("KEYSTORE_LOCKED");
+        expect(
+            defaultClassifyError(
+                Object.assign(new Error("anything"), {
+                    code: "ERR_KEYSTORE_UNAVAILABLE",
+                })
+            )
+        ).toBe("KEYSTORE_UNAVAILABLE");
+    });
+
+    it("falls through to message when code is a string but unknown", {
+        timeout: 5000,
+    }, () => {
+        // Hits the false-branch of `code === "ERR_KEYSTORE_UNAVAILABLE"`
+        // by supplying a recognised-string-code that is neither known
+        // value. Falls through to the message-based branch.
+        expect(
+            defaultClassifyError(
+                Object.assign(new Error("acl quota"), {
+                    code: "ERR_SOME_OTHER",
+                })
+            )
+        ).toBeUndefined();
+    });
+
+    it("ignores a non-string error.code", { timeout: 5000 }, () => {
+        expect(
+            defaultClassifyError(
+                Object.assign(new Error("acl quota"), { code: 42 })
+            )
+        ).toBeUndefined();
+    });
+
+    it("ignores a non-string error.message", { timeout: 5000 }, () => {
+        const err = Object.create(null) as { message?: unknown };
+        err.message = 42;
+        expect(defaultClassifyError(err)).toBeUndefined();
+    });
+
+    it("falls through message substrings", { timeout: 5000 }, () => {
+        expect(defaultClassifyError(new Error("Keystore Locked"))).toBe(
+            "KEYSTORE_LOCKED"
+        );
+        expect(defaultClassifyError(new Error("daemon not running"))).toBe(
+            "KEYSTORE_UNAVAILABLE"
+        );
+        expect(defaultClassifyError(new Error("service unavailable"))).toBe(
+            "KEYSTORE_UNAVAILABLE"
+        );
+        expect(defaultClassifyError(new Error("no such service"))).toBe(
+            "KEYSTORE_UNAVAILABLE"
+        );
+    });
+});

packages/api-stack/api/api-secrets-bun/src/adapter/adapter.ts

@@ -0,0 +1,295 @@
+import type { SecretsLike } from "@suaveplan/api-types/secrets";
+import z from "zod";
+import { type Allowlist, createAllowlist } from "../allowlist/allowlist.js";
+import {
+    SECRETS_BUN_CODES,
+    SecretsBunError,
+} from "../error-codes/error-codes.js";
+import { getSecretsBunInstruments } from "../otel/instruments.js";
+
+/**
+ * Structural view of `Bun.secrets`. Captured as an interface so tests
+ * inject a deterministic in-memory keystore without touching the real
+ * OS daemon, and so the adapter can be exercised under Node where the
+ * `Bun` global is absent.
+ */
+export interface BunSecretsKeystore {
+    get(args: { service: string; name: string }): Promise<string | null>;
+    set(args: { service: string; name: string; value: string }): Promise<void>;
+    delete(args: { service: string; name: string }): Promise<void>;
+}
+
+/**
+ * Classifier for errors thrown by the underlying `Bun.secrets` daemon.
+ * Returns a {@link SecretsBunError} code or `undefined` to let the
+ * caller wrap the error as `WRITE_FAILED` / `KEYSTORE_UNAVAILABLE` at
+ * its own discretion.
+ *
+ * The default classifier inspects `error.code` (Bun's convention for
+ * OS-keystore failures) and `error.message` for the well-known locked /
+ * unavailable substrings. Operators with bespoke keystore wrappers can
+ * supply their own to retag failure modes.
+ */
+export type BunSecretsErrorClassifier = (
+    err: unknown
+) => "KEYSTORE_LOCKED" | "KEYSTORE_UNAVAILABLE" | undefined;
+
+/**
+ * Construction options for {@link createBunSecretsAdapter}.
+ *
+ * - `service` — the `Bun.secrets` service namespace. Every plugin gets
+ *   its own service so a leaked plugin cannot enumerate sibling
+ *   plugins' secrets via the OS UI.
+ * - `allowlist` — per-plugin whitelist of permitted secret names, the
+ *   shape `manifest.secrets[].name` returns. Required and non-empty.
+ * - `keystore` — injectable {@link BunSecretsKeystore}. Defaults to
+ *   `globalThis.Bun.secrets`. Tests supply an in-memory implementation.
+ * - `classifyError` — optional override for the failure-mode classifier
+ *   above. Defaults to {@link defaultClassifyError}.
+ */
+export interface CreateBunSecretsAdapterOptions {
+    readonly service: string;
+    readonly allowlist: readonly string[];
+    readonly keystore?: BunSecretsKeystore;
+    readonly classifyError?: BunSecretsErrorClassifier;
+}
+
+const optionsSchema = z.object({
+    service: z.string().min(1),
+    allowlist: z.array(z.string().min(1)).min(1),
+    keystore: z.unknown().optional(),
+    classifyError: z.unknown().optional(),
+});
+
+/**
+ * Handle returned from {@link createBunSecretsAdapter}. Exposes the
+ * concrete {@link SecretsLike} the host installs as `ctx.secrets`, plus
+ * the adapter-specific `set` / `delete` helpers (the abstract surface
+ * stays read-only by design), the source allow-list, and an idempotent
+ * `dispose()` for lifecycle dedup.
+ */
+export interface BunSecretsAdapter {
+    readonly secrets: SecretsLike;
+    readonly allowlist: Allowlist;
+    set(name: string, value: string): Promise<void>;
+    deleteSecret(name: string): Promise<void>;
+    dispose(): void;
+}
+
+/**
+ * Default failure-mode classifier. Inspects `error.code` first (Bun's
+ * convention for OS-keystore errors) then falls back to a curated set
+ * of well-known message substrings.
+ */
+export function defaultClassifyError(
+    err: unknown
+): "KEYSTORE_LOCKED" | "KEYSTORE_UNAVAILABLE" | undefined {
+    if (typeof err !== "object" || err === null) return undefined;
+    const code = (err as { code?: unknown }).code;
+    if (typeof code === "string") {
+        if (code === "ERR_KEYSTORE_LOCKED") return "KEYSTORE_LOCKED";
+        if (code === "ERR_KEYSTORE_UNAVAILABLE") return "KEYSTORE_UNAVAILABLE";
+    }
+    const message = (err as { message?: unknown }).message;
+    if (typeof message === "string") {
+        const lower = message.toLowerCase();
+        if (lower.includes("locked")) return "KEYSTORE_LOCKED";
+        if (
+            lower.includes("not running") ||
+            lower.includes("unavailable") ||
+            lower.includes("no such service")
+        ) {
+            return "KEYSTORE_UNAVAILABLE";
+        }
+    }
+    return undefined;
+}
+
+const defaultBunGlobalProbe = (): unknown =>
+    (globalThis as { Bun?: unknown }).Bun;
+let bunGlobalProbe: () => unknown = defaultBunGlobalProbe;
+
+/**
+ * Test-only hook: replace the `globalThis.Bun` probe used by
+ * {@link defaultBunSecrets}. Bun publishes `globalThis.Bun` as
+ * `configurable: false, writable: false`, so direct mutation /
+ * `Object.defineProperty` throws under a real Bun runtime. Tests inject
+ * a probe that returns whatever shape is needed (e.g. `{ secrets: ... }`,
+ * `{}` to force the no-secrets branch, `undefined` for no-Bun). Pass
+ * `undefined` to restore the default `globalThis.Bun` probe. Not part of
+ * the public surface.
+ */
+export function __setBunGlobalProbeForTest(
+    probe: (() => unknown) | undefined
+): void {
+    bunGlobalProbe = probe ?? defaultBunGlobalProbe;
+}
+
+function defaultBunSecrets(): BunSecretsKeystore | undefined {
+    const bun = bunGlobalProbe() as
+        | { secrets?: BunSecretsKeystore }
+        | undefined
+        | null;
+    if (typeof bun !== "object" || bun === null) return undefined;
+    return bun.secrets;
+}
+
+/**
+ * Build a {@link BunSecretsAdapter} backed by `Bun.secrets`. The
+ * returned `secrets` handle satisfies `SecretsLike` and gates every
+ * read on the per-plugin allow-list. The adapter:
+ *
+ * 1. validates options with Zod and throws
+ *    `SECRETS_BUN.INVALID_OPTIONS` on failure;
+ * 2. probes `globalThis.Bun.secrets` if no `keystore` was supplied and
+ *    throws `SECRETS_BUN.KEYSTORE_UNAVAILABLE` when absent;
+ * 3. enforces the allow-list BEFORE any keystore round-trip;
+ * 4. distinguishes `NOT_FOUND` (`null` from `get`) from
+ *    `KEYSTORE_LOCKED` / `KEYSTORE_UNAVAILABLE` (classifier-tagged
+ *    errors) and never falls back silently;
+ * 5. emits `api.secrets.reads_total{backend="bun"}` on every successful
+ *    `get` value and `require`, `api.secrets.not_found_total` on every
+ *    permitted-but-absent read, and `api.secrets.denied_total` on every
+ *    allow-list rejection;
+ * 6. exposes idempotent `dispose()` for host lifecycle dedup — repeat
+ *    calls are no-ops, and post-dispose `get` / `require` throw
+ *    `KEYSTORE_UNAVAILABLE`.
+ */
+export function createBunSecretsAdapter(
+    options: CreateBunSecretsAdapterOptions
+): BunSecretsAdapter {
+    const parsed = optionsSchema.safeParse(options);
+    if (!parsed.success) {
+        throw new SecretsBunError(
+            SECRETS_BUN_CODES.INVALID_OPTIONS,
+            "error.secrets_bun.invalid_options",
+            { context: { issues: parsed.error.issues } }
+        );
+    }
+    const service = options.service;
+    const allowlist = createAllowlist(options.allowlist);
+    const keystore = options.keystore ?? defaultBunSecrets();
+    if (keystore === undefined) {
+        throw new SecretsBunError(
+            SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+            "error.secrets_bun.keystore_unavailable",
+            { context: { reason: "bun_secrets_global_absent" } }
+        );
+    }
+    const classifyError = options.classifyError ?? defaultClassifyError;
+    let disposed = false;
+
+    const instruments = () => getSecretsBunInstruments();
+
+    const guardLifecycle = (): void => {
+        if (disposed) {
+            throw new SecretsBunError(
+                SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+                "error.secrets_bun.keystore_unavailable",
+                { context: { reason: "adapter_disposed" } }
+            );
+        }
+    };
+
+    const guardAllowed = (name: string): void => {
+        if (!allowlist.has(name)) {
+            instruments().deniedTotal.add(1, { backend: "bun" });
+            allowlist.assertAllowed(name);
+        }
+    };
+
+    const wrapKeystoreError = (err: unknown, name: string): never => {
+        const tag = classifyError(err);
+        if (tag === "KEYSTORE_LOCKED") {
+            throw new SecretsBunError(
+                SECRETS_BUN_CODES.KEYSTORE_LOCKED,
+                "error.secrets_bun.keystore_locked",
+                { context: { name }, cause: err }
+            );
+        }
+        if (tag === "KEYSTORE_UNAVAILABLE") {
+            throw new SecretsBunError(
+                SECRETS_BUN_CODES.KEYSTORE_UNAVAILABLE,
+                "error.secrets_bun.keystore_unavailable",
+                { context: { name }, cause: err }
+            );
+        }
+        throw new SecretsBunError(
+            SECRETS_BUN_CODES.WRITE_FAILED,
+            "error.secrets_bun.write_failed",
+            { context: { name }, cause: err }
+        );
+    };
+
+    const keystoreGet = async (name: string): Promise<string | null> => {
+        try {
+            return await keystore.get({ service, name });
+        } catch (err) {
+            return wrapKeystoreError(err, name);
+        }
+    };
+
+    const get = async (name: string): Promise<string | undefined> => {
+        guardLifecycle();
+        guardAllowed(name);
+        const value = await keystoreGet(name);
+        if (value === null) {
+            instruments().notFoundTotal.add(1, { backend: "bun" });
+            return undefined;
+        }
+        instruments().readsTotal.add(1, { backend: "bun" });
+        return value;
+    };
+
+    const require = async (name: string): Promise<string> => {
+        guardLifecycle();
+        guardAllowed(name);
+        const value = await keystoreGet(name);
+        if (value === null) {
+            instruments().notFoundTotal.add(1, { backend: "bun" });
+            throw new SecretsBunError(
+                SECRETS_BUN_CODES.NOT_FOUND,
+                "error.secrets_bun.not_found",
+                { context: { name } }
+            );
+        }
+        instruments().readsTotal.add(1, { backend: "bun" });
+        return value;
+    };
+
+    const set = async (name: string, value: string): Promise<void> => {
+        guardLifecycle();
+        guardAllowed(name);
+        try {
+            await keystore.set({ service, name, value });
+        } catch (err) {
+            wrapKeystoreError(err, name);
+        }
+    };
+
+    const deleteSecret = async (name: string): Promise<void> => {
+        guardLifecycle();
+        guardAllowed(name);
+        try {
+            await keystore.delete({ service, name });
+        } catch (err) {
+            wrapKeystoreError(err, name);
+        }
+    };
+
+    const secrets: SecretsLike = {
+        get,
+        require,
+        list: () => allowlist.names,
+    };
+
+    return {
+        secrets,
+        allowlist,
+        set,
+        deleteSecret,
+        dispose(): void {
+            disposed = true;
+        },
+    };
+}

packages/api-stack/api/api-secrets-bun/src/adapter/index.ts

@@ -0,0 +1,9 @@
+export {
+    __setBunGlobalProbeForTest,
+    type BunSecretsAdapter,
+    type BunSecretsErrorClassifier,
+    type BunSecretsKeystore,
+    type CreateBunSecretsAdapterOptions,
+    createBunSecretsAdapter,
+    defaultClassifyError,
+} from "./adapter.js";

packages/api-stack/api/api-secrets-bun/src/allowlist/allowlist.md

@@ -0,0 +1,73 @@
+# `allowlist`
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+The allow-list module encapsulates the per-plugin scoping rule that
+defines the package's security boundary: a plugin can only read secrets
+that its manifest's `secrets[]` block declared, no matter what
+`Bun.secrets` happens to hold under the host's service namespace. Every
+`get` / `require` call routes through `assertAllowed` BEFORE any
+keystore round-trip, so a leaked plugin cannot probe key existence by
+name even when the OS daemon is reachable.
+
+The interface is intentionally minimal — a frozen ordered `names` array
+plus an O(1) `has` probe and the throwing `assertAllowed` guard — so the
+adapter can compose it without re-implementing the membership semantics.
+
+## Features
+
+- Frozen `names` array preserving manifest declaration order; safe to
+  return directly from the adapter's `list()`.
+- `has(name)` boolean probe for branchy callers (e.g. selective writes).
+- `assertAllowed(name)` guard that throws `SECRETS_BUN.NOT_ALLOWED`
+  with `context.name` populated for the audit log.
+- Silent de-duplication so a manifest that imports the same secret
+  twice does not crash at construction.
+
+## Usage: Basic
+
+```ts
+import { createAllowlist } from "@suaveplan/api-secrets-bun/allowlist";
+
+const al = createAllowlist(["STRIPE_SECRET_KEY", "JWT_SIGNING_KEY"]);
+
+al.assertAllowed("STRIPE_SECRET_KEY"); // no-op
+al.assertAllowed("AWS_SECRET_KEY"); // throws SECRETS_BUN.NOT_ALLOWED
+```
+
+## Usage: Advanced
+
+Compose the allow-list with the adapter to gate `set` as well as `get`:
+
+```ts
+import { createAllowlist } from "@suaveplan/api-secrets-bun/allowlist";
+
+const al = createAllowlist(manifest.secrets.map((s) => s.name));
+
+function writeIfAllowed(name: string, value: string): void {
+    al.assertAllowed(name);
+    return Bun.secrets.set({ service: "my-plugin", name, value });
+}
+```
+
+## API Reference
+
+- `createAllowlist(names: readonly string[]): Allowlist` — build a
+  frozen allow-list from a manifest-derived name list.
+- `Allowlist.names: readonly string[]` — frozen ordered view.
+- `Allowlist.has(name: string): boolean` — membership probe.
+- `Allowlist.assertAllowed(name: string): void` — throws
+  `SecretsBunError` with code `SECRETS_BUN.NOT_ALLOWED` on miss.
+
+## Implementation Notes
+
+The allow-list owns its `Set<string>` once at construction so per-call
+lookup is O(1). The `names` array is frozen at the top level only; the
+strings inside are primitives and already immutable. `assertAllowed`
+populates `context.name` so the audit trail can route a denied lookup
+back to the offending plugin without surfacing the value (there is no
+value yet — the call is rejected before keystore consultation).

packages/api-stack/api/api-secrets-bun/src/allowlist/allowlist.test.ts

@@ -0,0 +1,51 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import {
+    SECRETS_BUN_CODES,
+    SecretsBunError,
+} from "../error-codes/error-codes.js";
+import { createAllowlist } from "./allowlist.js";
+
+describe("createAllowlist", () => {
+    it("returns a frozen ordered names array", { timeout: 5000 }, () => {
+        const al = createAllowlist(["A", "B", "C"]);
+        expect(al.names).toEqual(["A", "B", "C"]);
+        expect(Object.isFrozen(al.names)).toBe(true);
+    });
+
+    it("has() probes membership", { timeout: 5000 }, () => {
+        const al = createAllowlist(["A"]);
+        expect(al.has("A")).toBe(true);
+        expect(al.has("B")).toBe(false);
+    });
+
+    it("de-duplicates names while preserving first-seen order", {
+        timeout: 5000,
+    }, () => {
+        const al = createAllowlist(["A", "B", "A", "C", "B"]);
+        expect(al.names).toEqual(["A", "B", "C"]);
+    });
+
+    it("assertAllowed is a no-op for permitted names", {
+        timeout: 5000,
+    }, () => {
+        const al = createAllowlist(["X"]);
+        expect(() => al.assertAllowed("X")).not.toThrow();
+    });
+
+    it("un-manifested read raises SECRETS_BUN_NOT_ALLOWED", {
+        timeout: 5000,
+    }, () => {
+        const al = createAllowlist(["STRIPE"]);
+        let caught: unknown;
+        try {
+            al.assertAllowed("AWS");
+        } catch (err) {
+            caught = err;
+        }
+        expect(caught).toBeInstanceOf(SecretsBunError);
+        expect((caught as SecretsBunError).code).toBe(
+            SECRETS_BUN_CODES.NOT_ALLOWED
+        );
+        expect((caught as SecretsBunError).context).toEqual({ name: "AWS" });
+    });
+});

packages/api-stack/api/api-secrets-bun/src/allowlist/allowlist.ts

@@ -0,0 +1,63 @@
+import {
+    SECRETS_BUN_CODES,
+    SecretsBunError,
+} from "../error-codes/error-codes.js";
+
+/**
+ * Per-plugin allow-list of secret names. Built once at adapter
+ * construction from the plugin's manifest `secrets[]` and consulted
+ * before any `Bun.secrets` round-trip.
+ *
+ * The shape is intentionally minimal — a `Set<string>` lookup + the
+ * frozen ordered array `list()` returns — so the surface is a stable
+ * source of truth for both the read gate and the enumerated names.
+ */
+export interface Allowlist {
+    /** Frozen array of permitted names in declaration order. */
+    readonly names: readonly string[];
+    /** O(1) membership probe. */
+    has(name: string): boolean;
+    /**
+     * Throws `SECRETS_BUN.NOT_ALLOWED` when `name` is outside the
+     * allow-list. Returns `void` on a permitted name.
+     */
+    assertAllowed(name: string): void;
+}
+
+/**
+ * Build an {@link Allowlist} from a manifest `secrets[]` derived list of
+ * names. The input is copied into a frozen array so downstream mutation
+ * cannot widen the surface after construction; the membership set is
+ * built once and reused on every probe.
+ *
+ * Duplicate names are silently de-duplicated — manifest authors who list
+ * the same secret twice (e.g. through two import paths) should not get a
+ * runtime crash, but the surface `list()` reports is the de-duplicated
+ * order-preserved view.
+ */
+export function createAllowlist(names: readonly string[]): Allowlist {
+    const seen = new Set<string>();
+    const ordered: string[] = [];
+    for (const raw of names) {
+        if (seen.has(raw)) continue;
+        seen.add(raw);
+        ordered.push(raw);
+    }
+    const frozen = Object.freeze(ordered);
+    const lookup = new Set<string>(ordered);
+    return {
+        names: frozen,
+        has(name: string): boolean {
+            return lookup.has(name);
+        },
+        assertAllowed(name: string): void {
+            if (!lookup.has(name)) {
+                throw new SecretsBunError(
+                    SECRETS_BUN_CODES.NOT_ALLOWED,
+                    "error.secrets_bun.not_allowed",
+                    { context: { name } }
+                );
+            }
+        },
+    };
+}

packages/api-stack/api/api-secrets-bun/src/allowlist/index.ts

@@ -0,0 +1 @@
+export { type Allowlist, createAllowlist } from "./allowlist.js";

packages/api-stack/api/api-secrets-bun/src/descriptor-builder/descriptor-builder.md

@@ -0,0 +1,93 @@
+# `descriptor-builder`
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module produces the `SecretDescriptor[]` shape the plugin manifest
+emits in its `secrets[]` block from a compact author-facing list. Pairing
+the manifest output with `descriptorAllowlist(descriptors)` gives the
+adapter's `allowlist` option, so a single declaration drives both the
+manifest the installer reads and the runtime gate the adapter enforces —
+the two cannot drift.
+
+The builder accepts either bare strings (shorthand for
+`{ name, required: true }`) or full row objects, mirroring the sibling
+env-adapter's `buildEnvSecretDescriptors`. Both shapes return frozen
+descriptors so consumers can ship the result directly without defensive
+copies.
+
+## Features
+
+- Compact bare-string shorthand (`"NAME"`) for required secrets.
+- Full row objects for `required: false`, `description`, `format`.
+- Frozen array + frozen descriptors for safe sharing.
+- `descriptorAllowlist` extracts the `name` field for the adapter's
+  `allowlist` option.
+
+## Usage: Basic
+
+```ts
+import {
+    buildBunSecretDescriptors,
+    descriptorAllowlist,
+} from "@suaveplan/api-secrets-bun/descriptor-builder";
+
+const descriptors = buildBunSecretDescriptors([
+    "STRIPE_SECRET_KEY",
+    "JWT_SIGNING_KEY",
+]);
+
+// Ship `descriptors` on the plugin manifest's `secrets[]`.
+// Pass `descriptorAllowlist(descriptors)` to `createBunSecretsAdapter`.
+```
+
+## Usage: Advanced
+
+Mix bare strings with optional secrets and richer metadata:
+
+```ts
+import {
+    buildBunSecretDescriptors,
+    descriptorAllowlist,
+    createBunSecretsAdapter,
+} from "@suaveplan/api-secrets-bun";
+
+const descriptors = buildBunSecretDescriptors([
+    "STRIPE_SECRET_KEY",
+    {
+        name: "OPTIONAL_WEBHOOK_KEY",
+        required: false,
+        description: "Override for inbound webhook signing",
+        format: "base64",
+    },
+]);
+
+const adapter = createBunSecretsAdapter({
+    service: "billing",
+    allowlist: descriptorAllowlist(descriptors),
+});
+```
+
+## API Reference
+
+- `buildBunSecretDescriptors(rows): readonly SecretDescriptor[]` —
+  build a frozen descriptor array from compact rows.
+- `BunSecretDescriptorInput` — full input row type.
+- `descriptorAllowlist(descs): readonly string[]` — extract names for
+  the adapter's `allowlist`.
+
+## Implementation Notes
+
+`required` defaults to `true` so a manifest author who forgets the field
+fails loud at install (the installer treats every required secret as
+must-be-present in the OS keystore). Setting it to `false` is the
+deliberate opt-in for optional secrets — feature-flagged paths that
+degrade gracefully when the value is absent.
+
+The descriptor objects are frozen with `Object.freeze` rather than
+shipped as `readonly` types alone because the manifest sometimes
+traverses through `JSON.parse` round-trips and downstream code historically
+mutated descriptors in place; freezing kills that class of bug.

packages/api-stack/api/api-secrets-bun/src/descriptor-builder/descriptor-builder.test.ts

@@ -0,0 +1,66 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import {
+    buildBunSecretDescriptors,
+    descriptorAllowlist,
+} from "./descriptor-builder.js";
+
+describe("buildBunSecretDescriptors", () => {
+    it("treats bare strings as required descriptors", {
+        timeout: 5000,
+    }, () => {
+        const descs = buildBunSecretDescriptors(["A", "B"]);
+        expect(descs).toEqual([
+            { name: "A", required: true },
+            { name: "B", required: true },
+        ]);
+    });
+
+    it("forwards required, description, and format", {
+        timeout: 5000,
+    }, () => {
+        const descs = buildBunSecretDescriptors([
+            {
+                name: "X",
+                required: false,
+                description: "test",
+                format: "base64",
+            },
+        ]);
+        expect(descs[0]).toEqual({
+            name: "X",
+            required: false,
+            description: "test",
+            format: "base64",
+        });
+    });
+
+    it("defaults required to true on rows that omit it", {
+        timeout: 5000,
+    }, () => {
+        const descs = buildBunSecretDescriptors([{ name: "X" }]);
+        expect(descs[0]?.required).toBe(true);
+    });
+
+    it("omits undefined description and format", { timeout: 5000 }, () => {
+        const descs = buildBunSecretDescriptors([{ name: "X" }]);
+        expect(Object.keys(descs[0] as object).sort()).toEqual([
+            "name",
+            "required",
+        ]);
+    });
+
+    it("freezes the array and every descriptor", { timeout: 5000 }, () => {
+        const descs = buildBunSecretDescriptors(["A"]);
+        expect(Object.isFrozen(descs)).toBe(true);
+        expect(Object.isFrozen(descs[0])).toBe(true);
+    });
+});
+
+describe("descriptorAllowlist", () => {
+    it("extracts just the names in order", { timeout: 5000 }, () => {
+        const descs = buildBunSecretDescriptors(["A", "B"]);
+        const names = descriptorAllowlist(descs);
+        expect(names).toEqual(["A", "B"]);
+        expect(Object.isFrozen(names)).toBe(true);
+    });
+});

packages/api-stack/api/api-secrets-bun/src/descriptor-builder/descriptor-builder.ts

@@ -0,0 +1,61 @@
+import type { SecretDescriptor } from "@suaveplan/api-secrets/descriptor";
+
+/**
+ * Input row for {@link buildBunSecretDescriptors}. The `name` becomes the
+ * descriptor's lookup name; `required` defaults to `true` because
+ * OS-keystore deployments treat omitted-but-needed secrets as a
+ * fail-fast install error (the operator has not yet stored the value);
+ * `description` and `format` are forwarded verbatim.
+ */
+export interface BunSecretDescriptorInput {
+    readonly name: string;
+    readonly required?: boolean;
+    readonly description?: string;
+    readonly format?: "string" | "base64" | "json";
+}
+
+/**
+ * Build a `SecretDescriptor[]` for a Bun-keystore-backed plugin from a
+ * compact allow-list. Accepts either bare strings (shorthand for
+ * `{ name, required: true }`) or full input rows. Useful when the
+ * plugin's `allowlist` and manifest `secrets[]` derive from the same
+ * source of truth.
+ *
+ * The returned array is frozen at the top level so callers can ship it
+ * to the manifest without worrying about downstream mutation; the
+ * descriptor objects inside are also frozen.
+ */
+export function buildBunSecretDescriptors(
+    rows: ReadonlyArray<string | BunSecretDescriptorInput>
+): readonly SecretDescriptor[] {
+    const out: SecretDescriptor[] = [];
+    for (const row of rows) {
+        if (typeof row === "string") {
+            out.push(Object.freeze({ name: row, required: true }));
+            continue;
+        }
+        const required = row.required ?? true;
+        const desc: SecretDescriptor = {
+            name: row.name,
+            required,
+            ...(row.description === undefined
+                ? {}
+                : { description: row.description }),
+            ...(row.format === undefined ? {} : { format: row.format }),
+        };
+        out.push(Object.freeze(desc));
+    }
+    return Object.freeze(out);
+}
+
+/**
+ * Extract just the `name` field from a descriptor list — the shape
+ * {@link createBunSecretsAdapter}'s `allowlist` expects. Pairs with
+ * {@link buildBunSecretDescriptors} so a single declaration drives both
+ * the manifest `secrets[]` and the adapter's allow-list.
+ */
+export function descriptorAllowlist(
+    descriptors: readonly SecretDescriptor[]
+): readonly string[] {
+    return Object.freeze(descriptors.map((d) => d.name));
+}

packages/api-stack/api/api-secrets-bun/src/descriptor-builder/index.ts

@@ -0,0 +1,5 @@
+export {
+    type BunSecretDescriptorInput,
+    buildBunSecretDescriptors,
+    descriptorAllowlist,
+} from "./descriptor-builder.js";

packages/api-stack/api/api-secrets-bun/src/error-codes/error-codes.md

@@ -0,0 +1,86 @@
+# `error-codes`
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module owns the stable `SECRETS_BUN.*` code registry and the
+`SecretsBunError` subclass thrown by every failure path inside the
+`Bun.secrets`-backed adapter. Splitting these codes from the upstream
+`SECRETS.*` namespace gives operators a one-glance distinction between
+the abstract secrets contract (`@suaveplan/api-secrets`), the
+environment-variable adapter (`SECRETS_ENV.*`), and the OS-keystore
+adapter (`SECRETS_BUN.*`).
+
+The registry is frozen at module-load time so no consumer can mutate the
+codes that downstream telemetry already aggregates on. `SecretsBunError`
+pins `error.name` to a single canonical string so structured loggers can
+group rolled-up failure rates across every concrete code.
+
+## Features
+
+- Six codes — `NOT_FOUND`, `NOT_ALLOWED`, `KEYSTORE_UNAVAILABLE`,
+  `KEYSTORE_LOCKED`, `WRITE_FAILED`, `INVALID_OPTIONS`.
+- Frozen registry via `defineCodes` so the surface cannot drift between
+  runs in the same process.
+- Single `SecretsBunError` subclass for every throwable.
+- Carries `cause` chains so the underlying `Bun.secrets` error survives
+  the wrap.
+
+## Usage: Basic
+
+```ts
+import {
+    SECRETS_BUN_CODES,
+    SecretsBunError,
+} from "@suaveplan/api-secrets-bun/error-codes";
+
+throw new SecretsBunError(
+    SECRETS_BUN_CODES.NOT_ALLOWED,
+    "error.secrets_bun.not_allowed",
+    { context: { name: "AWS_SECRET_KEY" } }
+);
+```
+
+## Usage: Advanced
+
+Catch and route on `code`:
+
+```ts
+import {
+    SECRETS_BUN_CODES,
+    SecretsBunError,
+} from "@suaveplan/api-secrets-bun/error-codes";
+
+try {
+    await secrets.require("STRIPE");
+} catch (err) {
+    if (err instanceof SecretsBunError) {
+        if (err.code === SECRETS_BUN_CODES.KEYSTORE_LOCKED) {
+            // Prompt the operator to unlock the OS keystore.
+        } else if (err.code === SECRETS_BUN_CODES.NOT_FOUND) {
+            // Surface a manifest-mismatch installer hint.
+        }
+    }
+    throw err;
+}
+```
+
+## API Reference
+
+- `SECRETS_BUN_CODES` — frozen `{ [name]: "SECRETS_BUN.<name>" }`.
+- `SecretsBunCode` — TypeScript union of every fully-qualified code.
+- `SECRETS_BUN_ERROR_NAME` — `"SecretsBunError"`.
+- `SecretsBunError extends SuaveplanError<SecretsBunCode>` — concrete
+  subclass with `code` typed to `SecretsBunCode`.
+
+## Implementation Notes
+
+Codes follow the project convention `<NAMESPACE>.<CASE>` so the dotted
+prefix is a stable telemetry key for grouping at the metric backend.
+The `SecretsBunError` constructor sets `this.name` AFTER `super` because
+`SuaveplanError`'s base assigns its own default name; overriding it
+unconditionally is the only way to guarantee the canonical name survives
+inheritance.

packages/api-stack/api/api-secrets-bun/src/error-codes/error-codes.test.ts

@@ -0,0 +1,51 @@
+import { describe, expect, it } from "@suaveplan/testing/runner";
+import {
+    SECRETS_BUN_CODES,
+    SECRETS_BUN_ERROR_NAME,
+    SecretsBunError,
+} from "./error-codes.js";
+
+describe("SECRETS_BUN_CODES registry", () => {
+    it("exposes the six documented codes", { timeout: 5000 }, () => {
+        expect(SECRETS_BUN_CODES).toEqual({
+            NOT_FOUND: "SECRETS_BUN.NOT_FOUND",
+            NOT_ALLOWED: "SECRETS_BUN.NOT_ALLOWED",
+            KEYSTORE_UNAVAILABLE: "SECRETS_BUN.KEYSTORE_UNAVAILABLE",
+            KEYSTORE_LOCKED: "SECRETS_BUN.KEYSTORE_LOCKED",
+            WRITE_FAILED: "SECRETS_BUN.WRITE_FAILED",
+            INVALID_OPTIONS: "SECRETS_BUN.INVALID_OPTIONS",
+        });
+    });
+
+    it("is frozen", { timeout: 5000 }, () => {
+        expect(Object.isFrozen(SECRETS_BUN_CODES)).toBe(true);
+    });
+});
+
+describe("SecretsBunError", () => {
+    it("pins the canonical name", { timeout: 5000 }, () => {
+        const err = new SecretsBunError(
+            SECRETS_BUN_CODES.NOT_ALLOWED,
+            "error.x"
+        );
+        expect(err.name).toBe(SECRETS_BUN_ERROR_NAME);
+    });
+
+    it("carries the code and context", { timeout: 5000 }, () => {
+        const err = new SecretsBunError(
+            SECRETS_BUN_CODES.NOT_FOUND,
+            "error.x",
+            { context: { name: "FOO" } }
+        );
+        expect(err.code).toBe("SECRETS_BUN.NOT_FOUND");
+        expect(err.context).toEqual({ name: "FOO" });
+    });
+
+    it("accepts no options argument", { timeout: 5000 }, () => {
+        const err = new SecretsBunError(
+            SECRETS_BUN_CODES.KEYSTORE_LOCKED,
+            "error.y"
+        );
+        expect(err.code).toBe("SECRETS_BUN.KEYSTORE_LOCKED");
+    });
+});

packages/api-stack/api/api-secrets-bun/src/error-codes/error-codes.ts

@@ -0,0 +1,72 @@
+import {
+    defineCodes,
+    SuaveplanError,
+    type SuaveplanErrorOptions,
+} from "@suaveplan/error";
+
+/**
+ * Frozen registry of error codes thrown by the Bun-keystore-backed
+ * `SecretsLike` adapter. Distinct from upstream `SECRETS.*` (owned by
+ * `@suaveplan/api-secrets`) and from sibling `SECRETS_ENV.*` so operators
+ * can tell at a glance whether the failure originated in the Bun
+ * allow-list enforcement, the OS keystore round-trip, or the env adapter.
+ *
+ * - `NOT_FOUND` — the requested name is permitted by the allow-list but
+ *   `Bun.secrets.get` returned `null` (no value under the configured
+ *   `service` / `name` pair). `get()` resolves to `undefined`; `require()`
+ *   throws this code.
+ * - `NOT_ALLOWED` — the requested name is not in the per-plugin
+ *   allow-list. Raised BEFORE the keystore is consulted so an attacker
+ *   cannot probe key existence by name. Same semantic as
+ *   `SECRETS_ENV.KEY_NOT_PERMITTED` but namespaced for telemetry split.
+ * - `KEYSTORE_UNAVAILABLE` — `Bun.secrets` itself is missing (running
+ *   under Node without the Bun shim) or the OS keystore daemon is not
+ *   running. Surfaces from both the adapter constructor (when the runtime
+ *   probe fails) and from individual `get` / `require` / `set` calls.
+ * - `KEYSTORE_LOCKED` — the OS keystore is locked (macOS Keychain
+ *   awaiting user prompt, Linux libsecret awaiting unlock, Windows
+ *   Credential Manager requiring smart-card auth). The adapter MUST NOT
+ *   fall back silently when this is observed.
+ * - `WRITE_FAILED` — `Bun.secrets.set` / `.delete` failed at the OS
+ *   layer for reasons other than `LOCKED` / `UNAVAILABLE` (e.g. quota,
+ *   ACL denial). Always wraps the underlying error as `cause`.
+ * - `INVALID_OPTIONS` — adapter construction options failed Zod
+ *   validation (empty `allowlist`, empty `service`, etc).
+ */
+export const SECRETS_BUN_CODES = defineCodes("SECRETS_BUN", [
+    "NOT_FOUND",
+    "NOT_ALLOWED",
+    "KEYSTORE_UNAVAILABLE",
+    "KEYSTORE_LOCKED",
+    "WRITE_FAILED",
+    "INVALID_OPTIONS",
+] as const);
+
+/**
+ * Union of fully-qualified `SECRETS_BUN.*` codes. Use as the `code` field
+ * type on a {@link SecretsBunError}-typed throwable.
+ */
+export type SecretsBunCode =
+    (typeof SECRETS_BUN_CODES)[keyof typeof SECRETS_BUN_CODES];
+
+/**
+ * Stable `error.name` value for every throwable this package produces.
+ * Structured loggers group on `name` for cross-code aggregation.
+ */
+export const SECRETS_BUN_ERROR_NAME = "SecretsBunError" as const;
+
+/**
+ * Concrete `SuaveplanError` subclass for Bun-adapter failures. Mirrors the
+ * shape of `SecretsError` / `SecretsEnvError` so consumers can
+ * `instanceof`-check or code-match without parsing message strings.
+ */
+export class SecretsBunError extends SuaveplanError<SecretsBunCode> {
+    public constructor(
+        code: SecretsBunCode,
+        messageKey: string,
+        options?: SuaveplanErrorOptions
+    ) {
+        super(code, messageKey, options);
+        this.name = SECRETS_BUN_ERROR_NAME;
+    }
+}

packages/api-stack/api/api-secrets-bun/src/error-codes/index.ts

@@ -0,0 +1,6 @@
+export {
+    SECRETS_BUN_CODES,
+    SECRETS_BUN_ERROR_NAME,
+    type SecretsBunCode,
+    SecretsBunError,
+} from "./error-codes.js";

packages/api-stack/api/api-secrets-bun/src/index.ts

@@ -0,0 +1,35 @@
+/**
+ * `@suaveplan/api-secrets-bun` — root barrel.
+ *
+ * Stage-8 `SecretsLike` adapter backed by `Bun.secrets` (macOS Keychain,
+ * Linux libsecret, Windows Credential Manager). Per-plugin allow-list
+ * enforcement plus an OS-keystore round-trip that distinguishes
+ * locked-keystore from missing-entry failure modes.
+ */
+
+export {
+    __setBunGlobalProbeForTest,
+    type BunSecretsAdapter,
+    type BunSecretsErrorClassifier,
+    type BunSecretsKeystore,
+    type CreateBunSecretsAdapterOptions,
+    createBunSecretsAdapter,
+    defaultClassifyError,
+} from "./adapter/index.js";
+export { type Allowlist, createAllowlist } from "./allowlist/index.js";
+export {
+    type BunSecretDescriptorInput,
+    buildBunSecretDescriptors,
+    descriptorAllowlist,
+} from "./descriptor-builder/index.js";
+export {
+    SECRETS_BUN_CODES,
+    SECRETS_BUN_ERROR_NAME,
+    type SecretsBunCode,
+    SecretsBunError,
+} from "./error-codes/index.js";
+export {
+    getSecretsBunInstruments,
+    resetSecretsBunInstruments,
+    type SecretsBunInstruments,
+} from "./otel/index.js";

packages/api-stack/api/api-secrets-bun/src/otel/index.ts

@@ -0,0 +1,5 @@
+export {
+    getSecretsBunInstruments,
+    resetSecretsBunInstruments,
+    type SecretsBunInstruments,
+} from "./instruments.js";

packages/api-stack/api/api-secrets-bun/src/otel/instruments.md

@@ -0,0 +1,75 @@
+# `otel/instruments`
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module owns the OpenTelemetry instrument bundle the
+`Bun.secrets`-backed adapter emits and a lazy cache that re-binds it to
+the current global `MeterProvider`. Dashboards aggregate the
+`api.secrets.*` counters across every concrete adapter via the
+`backend` label, so the metric names are deliberately backend-agnostic
+and the discriminator lives in label space.
+
+The cache is process-wide because OTel SDKs treat instruments as
+identity values: two `createCounter` calls with the same name on the
+same meter return the same instrument, but re-binding the meter against
+a freshly-installed provider in tests requires explicit reset.
+
+## Features
+
+- `api.secrets.reads_total{backend="bun"}` — counter of successful
+  reads from the adapter.
+- `api.secrets.not_found_total{backend="bun"}` — counter of permitted
+  names that the keystore reported as absent.
+- `api.secrets.denied_total{backend="bun"}` — counter of allow-list
+  rejections.
+- Cached bundle; `resetSecretsBunInstruments()` for tests.
+
+## Usage: Basic
+
+```ts
+import { getSecretsBunInstruments } from "@suaveplan/api-secrets-bun/otel";
+
+const inst = getSecretsBunInstruments();
+inst.readsTotal.add(1, { backend: "bun" });
+```
+
+## Usage: Advanced
+
+In a test, install a fresh `MeterProvider` and reset the cache so the
+next call re-binds to it:
+
+```ts
+import { metrics } from "@opentelemetry/api";
+import {
+    InMemoryMetricExporter,
+    MeterProvider,
+    PeriodicExportingMetricReader,
+} from "@opentelemetry/sdk-metrics";
+import { resetSecretsBunInstruments } from "@suaveplan/api-secrets-bun/otel";
+
+const exporter = new InMemoryMetricExporter(/* ... */);
+const reader = new PeriodicExportingMetricReader({ exporter });
+const provider = new MeterProvider({ readers: [reader] });
+metrics.setGlobalMeterProvider(provider);
+resetSecretsBunInstruments();
+```
+
+## API Reference
+
+- `getSecretsBunInstruments(): SecretsBunInstruments` — lazy, cached.
+- `resetSecretsBunInstruments(): void` — drop the cache.
+- `SecretsBunInstruments` — bundle of three `Counter` instruments.
+
+## Implementation Notes
+
+The meter name is the package name (`@suaveplan/api-secrets-bun`) so the
+metric source is unambiguous in OTel-Collector pipelines. Labels live on
+the `add` call rather than the descriptor because OTel's data model
+expects cardinality discriminators as attributes; the `backend` label
+takes a single value here but the shape matches the abstract
+`api-secrets` family where future backends will share the metric name
+and split on the label.

packages/api-stack/api/api-secrets-bun/src/otel/instruments.test.ts

@@ -0,0 +1,73 @@
+import { metrics } from "@opentelemetry/api";
+import {
+    AggregationTemporality,
+    InMemoryMetricExporter,
+    MeterProvider,
+    PeriodicExportingMetricReader,
+} from "@opentelemetry/sdk-metrics";
+import {
+    afterEach,
+    beforeEach,
+    describe,
+    expect,
+    it,
+} from "@suaveplan/testing/runner";
+import {
+    getSecretsBunInstruments,
+    resetSecretsBunInstruments,
+} from "./instruments.js";
+
+let exporter: InMemoryMetricExporter;
+let provider: MeterProvider;
+
+describe("api-secrets-bun OTel instruments", () => {
+    beforeEach(() => {
+        metrics.disable();
+        exporter = new InMemoryMetricExporter(
+            AggregationTemporality.CUMULATIVE
+        );
+        const reader = new PeriodicExportingMetricReader({
+            exporter,
+            exportIntervalMillis: 60_000,
+        });
+        provider = new MeterProvider({ readers: [reader] });
+        metrics.setGlobalMeterProvider(provider);
+        resetSecretsBunInstruments();
+    });
+
+    afterEach(async () => {
+        await provider.forceFlush();
+        metrics.disable();
+        resetSecretsBunInstruments();
+    });
+
+    it("returns the same cached bundle until reset", {
+        timeout: 5000,
+    }, () => {
+        const a = getSecretsBunInstruments();
+        const b = getSecretsBunInstruments();
+        expect(a).toBe(b);
+        resetSecretsBunInstruments();
+        const c = getSecretsBunInstruments();
+        expect(a).not.toBe(c);
+    });
+
+    it("emits all three instrument names with backend label", {
+        timeout: 5000,
+    }, async () => {
+        const inst = getSecretsBunInstruments();
+        inst.readsTotal.add(1, { backend: "bun" });
+        inst.notFoundTotal.add(1, { backend: "bun" });
+        inst.deniedTotal.add(1, { backend: "bun" });
+        await provider.forceFlush();
+        const names = new Set<string>();
+        for (const rm of exporter.getMetrics()) {
+            for (const sm of rm.scopeMetrics) {
+                for (const m of sm.metrics) names.add(m.descriptor.name);
+            }
+        }
+        expect(names.has("api.secrets.reads_total")).toBe(true);
+        expect(names.has("api.secrets.not_found_total")).toBe(true);
+        expect(names.has("api.secrets.denied_total")).toBe(true);
+    });
+});

packages/api-stack/api/api-secrets-bun/src/otel/instruments.ts

@@ -0,0 +1,58 @@
+import { type Counter, metrics } from "@opentelemetry/api";
+
+/**
+ * Bundle of OpenTelemetry instruments emitted by the Bun-keystore
+ * secrets adapter.
+ *
+ * - `readsTotal` — incremented every time `get` resolves to a value or
+ *   `require` succeeds. Labels: `{ backend: "bun" }` (always — pinned at
+ *   instrument creation time so dashboards aggregate across every
+ *   `api.secrets.reads_total` source uniformly).
+ * - `notFoundTotal` — incremented when a permitted name resolves to
+ *   `undefined` from the keystore. Labels: `{ backend: "bun" }`.
+ * - `deniedTotal` — incremented every time `assertAllowed` raises
+ *   `SECRETS_BUN.NOT_ALLOWED`. Mirrors the metric the env adapter emits
+ *   so dashboards roll up cross-backend.
+ */
+export interface SecretsBunInstruments {
+    readonly readsTotal: Counter;
+    readonly notFoundTotal: Counter;
+    readonly deniedTotal: Counter;
+}
+
+let cached: SecretsBunInstruments | undefined;
+
+/**
+ * Lazily build (and cache) the secrets instruments bundle against the
+ * current global `MeterProvider`. Call {@link resetSecretsBunInstruments}
+ * in test setup to force a re-bind against a freshly-installed provider.
+ */
+export function getSecretsBunInstruments(): SecretsBunInstruments {
+    if (cached !== undefined) return cached;
+    const meter = metrics.getMeter("@suaveplan/api-secrets-bun");
+    cached = {
+        readsTotal: meter.createCounter("api.secrets.reads_total", {
+            description:
+                "Total successful secrets reads, labelled by backend identifier",
+        }),
+        notFoundTotal: meter.createCounter("api.secrets.not_found_total", {
+            description:
+                "Total permitted-but-absent secret lookups, labelled by backend",
+        }),
+        deniedTotal: meter.createCounter("api.secrets.denied_total", {
+            description:
+                "Total allow-list rejections, labelled by backend identifier",
+        }),
+    };
+    return cached;
+}
+
+/**
+ * Drop the cached instrument bundle so the next
+ * {@link getSecretsBunInstruments} call rebinds against the global
+ * `MeterProvider` in effect at that point. Tests call this after
+ * installing a fresh `MeterProvider`.
+ */
+export function resetSecretsBunInstruments(): void {
+    cached = undefined;
+}

packages/api-stack/api/api-secrets-bun/tests/dep-graph.test.ts

@@ -0,0 +1,53 @@
+import { readdirSync, readFileSync, statSync } from "node:fs";
+import { join } from "node:path";
+import { describe, expect, it } from "@suaveplan/testing/runner";
+
+describe("dep-graph", () => {
+    it("runtime deps are exactly the expected set (sorted)", {
+        timeout: 5000,
+    }, () => {
+        const pkg = JSON.parse(
+            readFileSync(join(__dirname, "..", "package.json"), "utf8")
+        ) as { dependencies?: Record<string, string> };
+        const runtime = Object.keys(pkg.dependencies ?? {}).sort();
+        expect(runtime).toEqual([
+            "@opentelemetry/api",
+            "@suaveplan/api-secrets",
+            "@suaveplan/api-types",
+            "@suaveplan/error",
+            "tslib",
+            "zod",
+        ]);
+    });
+
+    it("zero peerDependencies", { timeout: 5000 }, () => {
+        const pkg = JSON.parse(
+            readFileSync(join(__dirname, "..", "package.json"), "utf8")
+        ) as { peerDependencies?: Record<string, string> };
+        expect(Object.keys(pkg.peerDependencies ?? {})).toEqual([]);
+    });
+});
+
+describe("zod-import-form", () => {
+    it("every src file uses default-import z", { timeout: 5000 }, () => {
+        function* walk(dir: string): Generator<string> {
+            for (const entry of readdirSync(dir)) {
+                const p = join(dir, entry);
+                if (statSync(p).isDirectory()) {
+                    yield* walk(p);
+                } else if (p.endsWith(".ts")) {
+                    yield p;
+                }
+            }
+        }
+        const srcDir = join(__dirname, "..", "src");
+        const bad: string[] = [];
+        for (const file of walk(srcDir)) {
+            const src = readFileSync(file, "utf8");
+            if (/import\s*\{\s*z\s*\}\s*from\s*["']zod["']/.test(src)) {
+                bad.push(file);
+            }
+        }
+        expect(bad).toEqual([]);
+    });
+});

packages/api-stack/api/api-secrets-bun/tests/setup/polyfills.ts

@@ -0,0 +1 @@
+export {};

packages/api-stack/api/api-secrets-bun/tsconfig.lib.json

@@ -0,0 +1,12 @@
+{
+    "$schema": "https://json.schemastore.org/tsconfig",
+    "extends": "../../../../tsconfig.base.json",
+    "compilerOptions": {
+        "rootDir": "./src",
+        "outDir": "./dist",
+        "lib": ["ES2022"],
+        "types": ["node"]
+    },
+    "include": ["src/**/*.ts"],
+    "exclude": ["src/**/*.test.ts", "dist", "node_modules"]
+}

packages/api-stack/api/api-secrets-bun/vite.config.ts

@@ -0,0 +1,36 @@
+import { defineConfig } from "vite";
+import dts from "vite-plugin-dts";
+
+export default defineConfig({
+    root: __dirname,
+    cacheDir: "../../../../node_modules/.vite/packages/api-secrets-bun",
+    plugins: [
+        dts({
+            entryRoot: "src",
+            tsconfigPath: "./tsconfig.lib.json",
+            insertTypesEntry: true,
+        }),
+    ],
+    build: {
+        outDir: "./dist",
+        emptyOutDir: true,
+        reportCompressedSize: true,
+        sourcemap: true,
+        lib: { entry: "src/index.ts", formats: ["es"] },
+        rollupOptions: {
+            treeshake: true,
+            output: {
+                preserveModules: true,
+                preserveModulesRoot: "src",
+                entryFileNames: "[name].js",
+            },
+            external: [
+                /^@suaveplan\//,
+                /^@opentelemetry\//,
+                /^node:/,
+                "tslib",
+                "zod",
+            ],
+        },
+    },
+});

packages/api-stack/api/api-secrets-bun/vitest.config.ts

@@ -0,0 +1,31 @@
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+    test: {
+        globals: false,
+        environment: "node",
+        pool: "forks",
+        setupFiles: ["./tests/setup/polyfills.ts"],
+        include: ["src/**/*.test.ts", "tests/**/*.test.ts"],
+        exclude: ["dist/**", "node_modules/**"],
+        coverage: {
+            provider: "istanbul",
+            reporter: ["text", "html", "lcov"],
+            include: ["src/**/*.ts"],
+            exclude: [
+                "src/**/*.test.ts",
+                "src/**/*.types.ts",
+                "src/**/index.ts",
+                "src/index.ts",
+                "tests/**",
+            ],
+            thresholds: {
+                statements: 100,
+                branches: 100,
+                functions: 100,
+                lines: 100,
+            },
+        },
+        testTimeout: 30000,
+    },
+});