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docs/api-stack/api/api-worker-host/README.md

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+# @suaveplan/api-worker-host - Worker-side runtime that hosts exactly one Suaveplan API plugin inside an isolated Worker thread. Provides the bootstrap entry point that handshakes with the main host, wires capability proxies via @suaveplan/api-worker-rpc, dispatches lifecycle commands (install/start/stop/uninstall/reload) to plugin hooks, and surfaces uncaught exceptions as WORKER_HOST.CRASHED envelopes so the main host's LifecycleDriver can transition the plugin to the crashed state.
+
+Worker-side runtime that hosts exactly one Suaveplan API plugin inside
+an isolated `Worker` thread. The main-process counterpart is
+`@suaveplan/api-host`; this package owns everything that runs *inside*
+the worker: bootstrap handshake, capability proxy wiring, lifecycle
+command dispatch, and uncaught-exception → `WORKER_HOST.CRASHED`
+propagation.
+
+This is API plugin system (design doc §2.2, §5.2a).
+The transport layer (`@suaveplan/api-worker-rpc`) is consumed here for
+every cross-boundary frame.
+
+<!-- begin:auto-docs -->
+## Documentation tree
+
+- [bootstrap](./src/bootstrap/bootstrap.md) — `bootstrapWorkerPlugin` is the single entry point a worker thread invokes to host exactly one Suaveplan API plugin. It…
+  - [bootstrap](./src/bootstrap/bootstrap.md) — `bootstrapWorkerPlugin` is the single entry point a worker thread invokes to host exactly one Suaveplan API plugin. It…
+- [capability-proxies](./src/capability-proxies/capability-proxies.md) — This module turns the capability-handle descriptor table delivered by the main host into a live, frozen map of RPC-back…
+  - [capability-proxies](./src/capability-proxies/capability-proxies.md) — This module turns the capability-handle descriptor table delivered by the main host into a live, frozen map of RPC-back…
+- [crash-detection](./src/crash-detection/crash-detection.md) — This module installs the worker-side safety net that turns silent process death into observable crash telemetry. Withou…
+  - [crash-detection](./src/crash-detection/crash-detection.md) — This module installs the worker-side safety net that turns silent process death into observable crash telemetry. Withou…
+- [error-codes](./src/error-codes/error-codes.md) — This module owns the namespaced `WORKER_HOST.*` error registry consumed by the worker-side runtime that hosts exactly o…
+  - [error-codes](./src/error-codes/error-codes.md) — This module owns the namespaced `WORKER_HOST.*` error registry consumed by the worker-side runtime that hosts exactly o…
+- [lifecycle](./src/lifecycle/lifecycle.md) — This module hosts the worker-side counterpart to the main host's `LifecycleDriver`. It owns the worker's nine-state lif…
+  - [lifecycle](./src/lifecycle/lifecycle.md) — This module hosts the worker-side counterpart to the main host's `LifecycleDriver`. It owns the worker's nine-state lif…
+- [protocol-extension](./src/protocol-extension/protocol-extension.md) — This module defines the Zod schemas that the worker host layers on top of the transport-level frame protocol owned by `…
+  - [protocol-extension](./src/protocol-extension/protocol-extension.md) — This module defines the Zod schemas that the worker host layers on top of the transport-level frame protocol owned by `…
+- [testing](./src/testing/testing.md) — `runWorkerHostConformance` spins up an in-process worker-shaped peer using paired `MessageChannel` ports. It exists so…
+  - [testing](./src/testing/testing.md) — `runWorkerHostConformance` spins up an in-process worker-shaped peer using paired `MessageChannel` ports. It exists so…
+<!-- end:auto-docs -->
+
+## Layout
+
+- [bootstrap](./src/bootstrap/bootstrap.md) — `bootstrapWorkerPlugin`
+  validates the manifest + capability handles, builds the proxy map,
+  mounts the lifecycle RPC server, posts the `worker-ready` frame.
+- [capability-proxies](./src/capability-proxies/capability-proxies.md) —
+  `installCapabilityProxies` builds frozen RPC-backed capability slots;
+  `getCapability` enforces declared capabilities.
+- [lifecycle](./src/lifecycle/lifecycle.md) — `createLifecycleReceiver`
+  owns the nine-state worker-side FSM and the `LifecycleAck` envelope.
+- [crash-detection](./src/crash-detection/crash-detection.md) —
+  `installCrashDetector` wires `uncaughtException` /
+  `unhandledRejection` to a `WORKER_HOST.CRASHED` envelope before
+  exiting.
+- [protocol-extension](./src/protocol-extension/protocol-extension.md) —
+  Zod schemas for every worker-host envelope.
+- [error-codes](./src/error-codes/error-codes.md) — nine stable
+  `WORKER_HOST.*` codes.
+- [testing](./src/testing/testing.md) —
+  `runWorkerHostConformance` in-process simulator.
+
+## Stability
+
+- **Version**: `0.1.0` (Original).
+- **Tier**: server (requires Node `process` + `MessageChannel`; Node
+  18+).
+- **Dependencies**: `@suaveplan/api-types`,
+  `@suaveplan/api-worker-rpc`, `@suaveplan/api-lifecycle`,
+  `@suaveplan/error`, `@suaveplan/events`, `@suaveplan/logger`,
+  `tslib`, `zod`.
+
+## Verification
+
+```bash
+bunx turbo lint typecheck test build --filter=@suaveplan/api-worker-host
+bunx turbo test:coverage --filter=@suaveplan/api-worker-host
+```
+
+All four coverage dimensions land at 100/100/100/100.
+

docs/api-stack/api/api-worker-host/src/bootstrap/bootstrap.md

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+# Worker bootstrap
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+`bootstrapWorkerPlugin` is the single entry point a worker thread
+invokes to host exactly one Suaveplan API plugin. It validates the
+manifest envelope and capability descriptor table at the wire
+boundary, builds the capability proxy map from a freshly-created
+`WorkerRpcClient`, instantiates the lifecycle receiver wrapping the
+plugin's hooks, mounts a `serveWorkerRpc` handler set on the control
+port that exposes `lifecycle.dispatch`, `host.manifest` and
+`host.state`, then posts the `worker-ready` frame back so the main
+host knows the worker is live. Any wiring failure surfaces as a
+typed `WorkerHostError` carrying `WORKER_HOST.MANIFEST_INVALID` or
+`WORKER_HOST.BOOTSTRAP_FAILED` so the main host's
+`LifecycleDriver` can transition the plugin to `install_failed`.
+
+## Features
+
+- Pure function — no module-load side effects, no global mutation,
+  no implicit import of `worker_threads`.
+- Two ports — `controlPort` for lifecycle, `capabilityPort` for
+  capability RPC; transports are abstracted through `PortLike` so
+  the same code paths run under real `MessageChannel` and Node's
+  `worker_threads` `MessagePort`.
+- Returns a `WorkerHost` handle exposing the validated manifest,
+  the proxy map, the lifecycle receiver and a `close()` disposer.
+- Optional `onReady` callback fires immediately after the ready
+  frame is posted — useful for in-process testing harnesses.
+
+## Usage: Basic
+
+```ts
+import {
+    bootstrapWorkerPlugin,
+} from "@suaveplan/api-worker-host/bootstrap";
+
+const host = bootstrapWorkerPlugin({
+    manifest: {
+        name: "demo",
+        version: "0.1.0",
+        capabilities: ["db"],
+        tier: "isolated",
+    },
+    capabilityHandles: { db: { methods: ["query"] } },
+    hooks: { install: async () => {} },
+    controlPort: portFromMainHost,
+    capabilityPort: capabilityPortFromMainHost,
+});
+```
+
+## Usage: Advanced
+
+Compose the bootstrap with a real `MessageChannel`-based simulator
+for unit tests:
+
+```ts
+import { createInProcessPortPair } from "@suaveplan/api-worker-rpc";
+import {
+    bootstrapWorkerPlugin,
+} from "@suaveplan/api-worker-host/bootstrap";
+
+const control = createInProcessPortPair();
+const caps = createInProcessPortPair();
+const host = bootstrapWorkerPlugin({
+    manifest: { name: "x", version: "0.1.0", capabilities: [], tier: "trusted" },
+    capabilityHandles: {},
+    hooks: {},
+    controlPort: control.serverPort,
+    capabilityPort: caps.serverPort,
+    onReady: (frame) => console.log("ready:", frame.manifest.name),
+});
+host.close();
+```
+
+## API Reference
+
+- `bootstrapWorkerPlugin(spec: BootstrapSpec): WorkerHost`
+- `BootstrapSpec`:
+    - `manifest: ManifestEnvelope`
+    - `capabilityHandles: CapabilityHandles`
+    - `hooks: PluginLifecycleHooks`
+    - `controlPort: PortLike` / `capabilityPort: PortLike`
+    - `onReady?: (frame: WorkerReadyFrame) => void`
+- `WorkerHost`: `manifest`, `capabilities`, `receiver`, `close()`
+
+## Implementation Notes
+
+The two ports are intentionally separated so capability RPC cannot
+starve lifecycle control (or vice versa) — different queues,
+different correlation-id namespaces, different backpressure budgets.
+On failure the bootstrap closes any RPC client it already opened
+before throwing, so the worker never leaks a half-attached
+`MessagePort` listener. The ready frame is posted *after* every
+piece of wiring succeeds; an early failure means no ready frame and
+the main host can detect a stillborn worker via timeout.

docs/api-stack/api/api-worker-host/src/capability-proxies/capability-proxies.md

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+# Capability proxies (worker side)
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module turns the capability-handle descriptor table delivered by
+the main host into a live, frozen map of RPC-backed capability slots
+that the worker host hands to the plugin via its `PluginContext`. Every
+slot method, regardless of how it looked on the trusted-tier surface,
+becomes an async function whose body is a single `client.call(...)`
+into `@suaveplan/api-worker-rpc`. The plugin author cannot — by design
+— tell whether the capability they hold is in-process or proxied across
+the worker boundary; the structural shape is identical.
+
+## Features
+
+- `installCapabilityProxies(handles, client)` — validates the handle
+  table with Zod, then builds a frozen
+  `Record<capability, Record<method, fn>>` table; each method dispatches
+  via `client.call("<capability>.<method>", args)`.
+- `getCapability(table, name)` — explicit accessor that raises
+  `WORKER_HOST.CAPABILITY_HANDLE_MISSING` when the plugin asks for a
+  capability the main host never declared, so missing wiring fails
+  loudly rather than producing `undefined` at runtime.
+- Slot objects are `Object.create(null)` + `Object.freeze` to deny
+  accidental mutation and prototype-pollution surface.
+
+## Usage: Basic
+
+```ts
+import { createWorkerRpcClient } from "@suaveplan/api-worker-rpc";
+import {
+    installCapabilityProxies,
+} from "@suaveplan/api-worker-host/capability-proxies";
+
+const client = createWorkerRpcClient(controlPort);
+const caps = installCapabilityProxies(
+    { db: { methods: ["query"] } },
+    client.client
+);
+await caps.db?.query?.("SELECT 1");
+```
+
+## Usage: Advanced
+
+Use `getCapability` inside the plugin context builder so unwired
+capabilities never reach handler code:
+
+```ts
+import {
+    getCapability,
+    installCapabilityProxies,
+} from "@suaveplan/api-worker-host/capability-proxies";
+
+const proxies = installCapabilityProxies(handles, client);
+const ctx = {
+    capabilities: {
+        db: getCapability(proxies, "db"),
+        logger: getCapability(proxies, "logger"),
+    },
+};
+```
+
+## API Reference
+
+- `installCapabilityProxies(handles: CapabilityHandles, client: WorkerRpcClient): CapabilityProxyMap`
+- `getCapability(proxies: CapabilityProxyMap, name: string): CapabilityProxy`
+- `CapabilityProxy` — `Record<string, (...args) => Promise<unknown>>`
+- `CapabilityProxyMap` — `Readonly<Record<string, CapabilityProxy>>`
+
+## Implementation Notes
+
+The wire method name is `"<capability>.<method>"` rather than just
+`method` so the main host's RPC server can route each call to the
+correct capability adapter without keeping per-channel state. Returning
+frozen objects also means consumers of the proxy table cannot
+accidentally graft synchronous methods onto a slot — which would break
+the trusted-vs-isolated structural-equivalence requirement in spec
+delta §"Plugin code cannot distinguish trusted from isolated tier".

docs/api-stack/api/api-worker-host/src/crash-detection/crash-detection.md

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+# Worker crash detection
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module installs the worker-side safety net that turns silent
+process death into observable crash telemetry. Without it, a plugin's
+uncaught synchronous throw or unhandled promise rejection would tear
+the Node `Worker` down with no signal to the main host's
+`LifecycleDriver` — leaving the plugin stuck in `started` until the
+control port's `close` event eventually fires (which is too late to
+attribute the failure to a specific plugin handler). The detector
+captures both `uncaughtException` and `unhandledRejection`, posts a
+`WORKER_HOST.CRASHED` envelope over the control port, then invokes the
+configured termination hook (`process.exit(1)` by default).
+
+## Features
+
+- `installCrashDetector({ controlPort, process?, onTerminate? })` —
+  returns a `CrashDetector` with `close()` + `trigger(cause)`.
+- Structural `ProcessLike` surface — unit tests substitute a fake
+  process so the real test runner does not exit.
+- `onTerminate` override — tests record the intended exit code
+  instead of actually exiting.
+- `trigger(cause)` lets the lifecycle layer escalate a fatal
+  bootstrap error to the same code path as an uncaught throw.
+- Reports are wrapped in a typed `WorkerHostError(CRASHED, ..., {
+  cause })` so the original throwable is preserved via the wire
+  `cause` field after reconstruction on the main host.
+
+## Usage: Basic
+
+```ts
+import {
+    installCrashDetector,
+} from "@suaveplan/api-worker-host/crash-detection";
+
+const detector = installCrashDetector({ controlPort });
+// later
+detector.close();
+```
+
+## Usage: Advanced
+
+Inject a fake `process` for deterministic testing — handlers fire
+synchronously, exits are recorded:
+
+```ts
+import {
+    installCrashDetector,
+} from "@suaveplan/api-worker-host/crash-detection";
+
+let handler: ((err: Error) => void) | undefined;
+const fakeProcess = {
+    on: (_: string, l: (err: Error) => void) => { handler = l; },
+    off: () => {},
+    exit: () => {},
+};
+const exits: number[] = [];
+installCrashDetector({
+    controlPort: port,
+    process: fakeProcess as never,
+    onTerminate: (code) => exits.push(code),
+});
+handler?.(new Error("boom"));
+```
+
+## API Reference
+
+- `installCrashDetector(opts: CrashDetectorOptions): CrashDetector`
+- `CrashDetectorOptions`:
+    - `controlPort: PortLike` — required
+    - `process?: ProcessLike`
+    - `onTerminate?: (exitCode: number) => void`
+- `CrashDetector`:
+    - `close(): void`
+    - `trigger(cause: unknown): void`
+- `ProcessLike` — `{ on, off, exit }` subset of Node `process`.
+
+## Implementation Notes
+
+`postMessage` is wrapped in a try/catch because the port may already
+be closing by the time a crash fires — best effort there, no nested
+crash on top of the original. The `close()` flag also guards against
+re-entrant invocations triggered by the very crash handlers being
+detached. The default `process` lookup is a `globalThis`-based read
+so the module never imports `node:process` at module load — keeping
+it tree-shake-clean for any future browser-tier consumer that
+substitutes its own `ProcessLike`.

docs/api-stack/api/api-worker-host/src/error-codes/error-codes.md

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+# Worker host error codes
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module owns the namespaced `WORKER_HOST.*` error registry consumed by
+the worker-side runtime that hosts exactly one Suaveplan API plugin. Every
+failure path that originates inside the worker host itself — boot failure,
+malformed manifest envelope, missing capability handle, lifecycle hook
+throw, handshake timeout, uncaught exception — raises a
+`WorkerHostError` carrying one of these codes so the main host's
+`LifecycleDriver` can branch deterministically on the literal code value
+rather than parsing free-form messages.
+
+The registry is deliberately narrow: capability transport failures
+surface through `WORKER_RPC.*` (owned by `@suaveplan/api-worker-rpc`),
+plugin-author runtime failures surface through whatever code the plugin's
+own error registry defines, and lifecycle FSM violations on the main side
+surface through `LIFECYCLE.*`. Codes here describe failures that the
+worker host alone can detect and report.
+
+## Features
+
+- `defineCodes("WORKER_HOST", [...])` produces a frozen string-literal
+  registry consumable as `WORKER_HOST_CODES.CRASHED` and friends.
+- `WorkerHostError extends SuaveplanError<WorkerHostCode>` — fully
+  type-narrowed `code` field; carries the same serialise/redact/i18n
+  surface as every other `@suaveplan/error` subclass.
+- Nine stable codes covering bootstrap, manifest validation, capability
+  wiring, lifecycle dispatch, handshake, crash detection, and FSM
+  rejection.
+
+## Usage: Basic
+
+```ts
+import { WORKER_HOST_CODES, WorkerHostError } from "@suaveplan/api-worker-host/error-codes";
+
+throw new WorkerHostError(
+    WORKER_HOST_CODES.MANIFEST_INVALID,
+    "manifest envelope failed schema check"
+);
+```
+
+## Usage: Advanced
+
+Branch on code values in the main host's lifecycle driver to drive FSM
+transitions and crash-restart accounting:
+
+```ts
+import { WORKER_HOST_CODES } from "@suaveplan/api-worker-host/error-codes";
+
+function onWorkerEnvelopeError(err: { code: string }): void {
+    switch (err.code) {
+        case WORKER_HOST_CODES.CRASHED:
+            crashBudget.recordCrash();
+            driver.transition("crashed");
+            break;
+        case WORKER_HOST_CODES.LIFECYCLE_HOOK_THREW:
+            driver.transition("start_failed");
+            break;
+        case WORKER_HOST_CODES.MAIN_HANDSHAKE_TIMEOUT:
+            driver.transition("install_failed");
+            break;
+        default:
+            driver.recordUnknown(err);
+    }
+}
+```
+
+## API Reference
+
+- `WORKER_HOST_CODES` — frozen registry keyed by base name, valued by
+  fully-qualified `"WORKER_HOST.<NAME>"` string.
+- `WorkerHostCode` — discriminated union over every code value.
+- `WorkerHostError` — `SuaveplanError<WorkerHostCode>` subclass.
+
+## Implementation Notes
+
+The registry list is closed: adding a code requires an OpenSpec change.
+Order matches the spec delta authored in
+the specification so the
+verification trail (`**Verified by:**` lines) lines up with the test
+files that exercise each code path. The error class overrides `name` so
+`err.name === "WorkerHostError"` survives across the structured-clone
+boundary back to the main host.

docs/api-stack/api/api-worker-host/src/lifecycle/lifecycle.md

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+# Worker-side lifecycle receiver
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module hosts the worker-side counterpart to the main host's
+`LifecycleDriver`. It owns the worker's nine-state lifecycle FSM
+(`loaded` → `installing` → `installed` → `starting` → `started` →
+`stopping` → `stopped` → `uninstalling` → `uninstalled`), validates
+every inbound lifecycle command at the wire boundary with the Zod
+schema from `protocol-extension`, dispatches the matched command to
+the plugin author's hook (`install` / `start` / `stop` /
+`uninstall` / `reload`), and returns a serialisable `LifecycleAck`
+envelope the main host's RPC server forwards back to its driver. The
+receiver is intentionally synchronous in its state mutation but
+asynchronous in its hook invocation — the hook's promise drives the
+ack timing.
+
+## Features
+
+- `createLifecycleReceiver({ hooks, initialState? })` — pure factory;
+  no global state, no module-load side effects.
+- Tracks current state with a closure variable; `state()` exposes it
+  for observability and tests.
+- `dispatch(raw)` validates the command, refuses illegal transitions
+  with `WORKER_HOST.INVALID_LIFECYCLE_TRANSITION`, runs the matched
+  hook (if defined), and on throw reconstructs the error via
+  `api-worker-rpc`'s `errorToEnvelope` while rewinding to the
+  pre-command state for retry.
+- Hook throws are wrapped in
+  `WORKER_HOST.LIFECYCLE_HOOK_THREW` carrying `cause` + `context`
+  describing which hook triggered.
+- Unknown command kinds raise
+  `WORKER_HOST.UNKNOWN_LIFECYCLE_COMMAND`.
+
+## Usage: Basic
+
+```ts
+import {
+    createLifecycleReceiver,
+} from "@suaveplan/api-worker-host/lifecycle";
+
+const receiver = createLifecycleReceiver({
+    hooks: {
+        install: async () => { await db.migrate(); },
+        start: async () => { httpServer.listen(); },
+    },
+});
+const ack = await receiver.dispatch({ command: "install" });
+if (ack.ok) console.log("installed");
+```
+
+## Usage: Advanced
+
+Pair the receiver with `serveWorkerRpc` so the main host can drive
+lifecycle over a dedicated `MessagePort`:
+
+```ts
+import { serveWorkerRpc } from "@suaveplan/api-worker-rpc";
+import {
+    createLifecycleReceiver,
+} from "@suaveplan/api-worker-host/lifecycle";
+
+const receiver = createLifecycleReceiver({ hooks });
+serveWorkerRpc(controlPort, {
+    "lifecycle.dispatch": async (params) =>
+        receiver.dispatch(params[0]),
+});
+```
+
+## API Reference
+
+- `createLifecycleReceiver(opts: LifecycleReceiverOptions): LifecycleReceiver`
+- `LifecycleReceiverOptions`:
+    - `hooks: PluginLifecycleHooks`
+    - `initialState?: WorkerLifecycleState`
+- `LifecycleReceiver`:
+    - `state(): WorkerLifecycleState`
+    - `dispatch(raw: unknown): Promise<LifecycleAck>`
+- `PluginLifecycleHooks` — optional async hooks per command kind.
+- `WorkerLifecycleState` — nine-state union.
+
+## Implementation Notes
+
+Legal-from sets are declared at module scope so the transition table
+is auditable in one read. The `*ing` state is exposed mid-hook so the
+main host can observe an in-flight transition rather than only the
+terminal state. On hook throw, the receiver reverts to the *previous*
+state (not the *ing* state) so retry attempts are evaluated against
+the correct legal-from set. Schema validation runs before any state
+mutation — a malformed envelope cannot push the FSM out of
+`loaded` accidentally.

docs/api-stack/api/api-worker-host/src/protocol-extension/protocol-extension.md

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+# Worker host protocol extensions
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+This module defines the Zod schemas that the worker host layers on top
+of the transport-level frame protocol owned by
+`@suaveplan/api-worker-rpc`. Where the transport package speaks
+`request` / `response` / `cancel` / `stream-*` / `hello` / `goodbye`
+frames, the worker host carries higher-level *control envelopes* —
+manifest advertisement, lifecycle commands, lifecycle acks, crash
+reports and capability-handle descriptors — inside those frames'
+payloads. Keeping the envelope schemas in one place lets the bootstrap,
+lifecycle and crash-detection modules import a single validator and
+gives the conformance harness one round-trip surface to test against.
+
+## Features
+
+- `manifestEnvelopeSchema` — the minimum manifest shape the main host
+  needs for FSM bookkeeping (name, version, capabilities, tier).
+- `workerReadyFrameSchema` — initial readiness frame the worker pushes
+  after the plugin module has been imported and validated.
+- `lifecycleCommandSchema` — discriminated by `command:
+  "install"|"start"|"stop"|"uninstall"|"reload"`.
+- `lifecycleAckSchema` — discriminated union over success / failure
+  acks carrying a reconstructed `ErrorEnvelope` on failure.
+- `crashReportSchema` — emitted by the crash detector before the worker
+  exits non-zero.
+- `capabilityHandlesSchema` — descriptor table delivered by the main
+  host so the worker knows which capability methods to expose as RPC
+  proxies.
+
+## Usage: Basic
+
+```ts
+import {
+    workerReadyFrameSchema,
+} from "@suaveplan/api-worker-host/protocol-extension";
+
+const ready = workerReadyFrameSchema.parse({
+    kind: "worker-ready",
+    manifest: {
+        name: "demo",
+        version: "0.1.0",
+        capabilities: ["db", "logger"],
+        tier: "isolated",
+    },
+});
+```
+
+## Usage: Advanced
+
+Validate every payload at the wire boundary in the lifecycle receiver:
+
+```ts
+import {
+    lifecycleAckSchema,
+    lifecycleCommandSchema,
+} from "@suaveplan/api-worker-host/protocol-extension";
+
+function dispatch(raw: unknown): void {
+    const cmd = lifecycleCommandSchema.parse(raw);
+    runHook(cmd.command).then(
+        () => send(lifecycleAckSchema.parse({ ok: true })),
+        (err) => send(
+            lifecycleAckSchema.parse({
+                ok: false,
+                error: errorToEnvelope(err),
+            })
+        )
+    );
+}
+```
+
+## API Reference
+
+- `manifestEnvelopeSchema` / `ManifestEnvelope`
+- `workerReadyFrameSchema` / `WorkerReadyFrame`
+- `lifecycleCommandKindSchema` / `LifecycleCommandKind`
+- `lifecycleCommandSchema` / `LifecycleCommand`
+- `lifecycleAckOkSchema` / `lifecycleAckErrSchema` / `lifecycleAckSchema`
+  / `LifecycleAck`
+- `crashReportSchema` / `CrashReport`
+- `capabilityHandlesSchema` / `CapabilityHandles`
+- `errorEnvelopeSchema` / `ErrorEnvelope` — re-exported from the
+  transport layer for boundary use.
+
+## Implementation Notes
+
+Schemas are declared at module scope and reused on every parse so Zod
+does not rebuild the type graph per call. The tier enum is fixed to the
+three values from design doc §2.2 (`trusted` / `isolated` / `sandboxed`)
+— extending it requires an OpenSpec change. Capability handles only
+carry the *method names* exposed by each capability proxy; the actual
+`MessagePort` transfer happens out-of-band as part of the underlying
+`worker_threads` channel setup.

docs/api-stack/api/api-worker-host/src/testing/testing.md

@@ -0,0 +1,92 @@
+# Worker host conformance harness
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+`runWorkerHostConformance` spins up an in-process worker-shaped peer
+using paired `MessageChannel` ports. It exists so this package's own
+test suite — and the lifecycle-driver tests inside `api-host` — can
+exercise the full bootstrap → lifecycle → capability-proxy chain
+without spawning a real `node:worker_threads` `Worker`. Two paired
+ports are wired up (one for control, one for capability), the
+bootstrap is run on the worker-side ports, a stub capability server
+is mounted on the main-side of the capability port, and a main-side
+RPC client is wired to the control port — giving callers everything
+they need to drive lifecycle commands and observe capability call
+dispatch deterministically.
+
+## Features
+
+- Optional overrides for `manifest`, `capabilityHandles`, plugin
+  `hooks` and the main-side `capabilityHandlers`.
+- Reasonable defaults (`{ name: "test-plugin", version: "0.1.0",
+  tier: "isolated", capabilities: [] }`) so trivial tests need zero
+  setup.
+- Returns the live `WorkerHost`, the main-side `WorkerRpcClient`,
+  the stub capability server, both port pairs and a single
+  `dispose()` that tears everything down in reverse order.
+- No real `Worker` thread spawned — pure structured-clone routing
+  via `MessageChannel`.
+
+## Usage: Basic
+
+```ts
+import {
+    runWorkerHostConformance,
+} from "@suaveplan/api-worker-host/testing";
+
+const h = runWorkerHostConformance({
+    hooks: { install: () => {} },
+});
+const ack = await h.mainClient.call("lifecycle.dispatch", [
+    { command: "install" },
+]);
+h.dispose();
+```
+
+## Usage: Advanced
+
+Provide capability handles + main-side handlers to round-trip a
+capability call:
+
+```ts
+import {
+    runWorkerHostConformance,
+} from "@suaveplan/api-worker-host/testing";
+
+const h = runWorkerHostConformance({
+    capabilityHandles: { db: { methods: ["query"] } },
+    capabilityHandlers: {
+        "db.query": (params) => ({ rows: [params[0]] }),
+    },
+});
+const query = h.host.capabilities.db?.query;
+const result = await query?.("SELECT 1");
+h.dispose();
+```
+
+## API Reference
+
+- `runWorkerHostConformance(opts?): WorkerHostConformanceHarness`
+- `WorkerHostConformanceOptions`:
+    - `manifest?: ManifestEnvelope`
+    - `capabilityHandles?: CapabilityHandles`
+    - `hooks?: PluginLifecycleHooks`
+    - `capabilityHandlers?: WorkerRpcHandlers`
+- `WorkerHostConformanceHarness`:
+    - `host: WorkerHost`
+    - `mainClient: WorkerRpcClient`
+    - `capabilityServer: WorkerRpcServer`
+    - `controlPorts / capabilityPorts: InProcessPortPair`
+    - `dispose(): void`
+
+## Implementation Notes
+
+`dispose()` closes the main-side client first so it stops sending,
+then the worker host (which closes its own server + capability
+client), then the main-side capability server, then both port pairs.
+Closing in reverse-construction order avoids `port already closed`
+log noise in vitest while still flushing the inflight RPC budget.