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+# DTP_CODES + DriveTemplateError
+
+## Purpose
+
+Frozen registry of error codes plus the error class for the `@suaveplan/drive-template` package. Eleven codes cover the complete failure surface: the eight-step validation pipeline that `Drive.hydrateFrom(template)` runs (version check, expiry, freshness, replay, issuer trust, signature, recursion depth, file consistency) plus three operational codes for CDN signature failure, inline-file signature failure, and key-grant rejection. Consumers branch on `code` programmatically; messages are for humans only.
+
+## Features
+
+- Eleven codes mapping one-to-one to the eight-step pipeline plus three operational paths.
+- `DTP_CODES` is frozen via `defineCodes` from `@suaveplan/error` — adding a code requires a code change and a spec update.
+- `DriveTemplateError extends SuaveplanError<DtpErrorCode>` — inherits cause-chain traversal, redaction, and JSON wire format.
+- Type-level exhaustiveness on switch statements via the literal-string `DtpErrorCode` union.
+
+## Usage: Basic Example
+
+```ts
+import { DriveTemplateError, DTP_CODES } from "@suaveplan/drive-template/errors";
+
+throw new DriveTemplateError(
+    DTP_CODES.TEMPLATE_EXPIRED,
+    "template expired at 2026-01-01T00:00:00Z",
+);
+```
+
+## Usage: Advanced Example
+
+```ts
+import {
+    DriveTemplateError,
+    DTP_CODES,
+    type DtpErrorCode,
+} from "@suaveplan/drive-template/errors";
+
+const remediation: Record<DtpErrorCode, string> = {
+    "DTP.TEMPLATE_VERSION_UNSUPPORTED": "Update the client; this template uses a newer schema.",
+    "DTP.TEMPLATE_EXPIRED": "Request a fresh template from the issuer.",
+    "DTP.TEMPLATE_STALE": "Request a fresh template; this one is more than 24h old.",
+    "DTP.TEMPLATE_REPLAY": "Template nonce already seen; the issuer must mint a new one.",
+    "DTP.TEMPLATE_UNTRUSTED_ISSUER": "Add the issuer to globalPolicy.trustedKeyAuthorities.",
+    "DTP.TEMPLATE_SIG_INVALID": "Template signature does not match the canonical bytes; possible tampering.",
+    "DTP.TEMPLATE_TOO_DEEP": "Folder recursion exceeds the 32-level cap.",
+    "DTP.TEMPLATE_MALFORMED": "Per-file consistency violated; check chunkSize, totalChunks, and manifest fields.",
+    "DTP.CDN_BAD_SIGNATURE": "CDN response failed Ed25519 verification; falling back to mesh.",
+    "DTP.INLINE_SIG_INVALID": "Inline file's stored signature does not match the bytes.",
+    "DTP.KEY_GRANT_REJECTED": "Key grant signature, recipient, or issuer did not match the template.",
+};
+
+try {
+    // hydrate code...
+} catch (err) {
+    if (err instanceof DriveTemplateError) {
+        console.error(`[${err.code}] ${err.message}`);
+        console.error("Remediation:", remediation[err.code]);
+    }
+}
+```
+
+## API Reference
+
+### `const DTP_CODES`
+
+Frozen object mapping uppercase code names to wire-format strings. Eleven entries:
+
+**Eight-step validation pipeline** (matches `DTP-05` ordering):
+
+- `TEMPLATE_VERSION_UNSUPPORTED` — `template.schemaVersion !== 1`. Future schema versions ship as new packages.
+- `TEMPLATE_EXPIRED` — `Date.now() >= template.expiresAt`.
+- `TEMPLATE_STALE` — `Date.now() - template.issuedAt > 24h`. Templates issued more than 24h ago are rejected even if not yet expired.
+- `TEMPLATE_REPLAY` — `(driveId, nonce)` already seen in the local LRU cache (last 1024 entries).
+- `TEMPLATE_UNTRUSTED_ISSUER` — `template.issuer` is not in `globalPolicy.trustedKeyAuthorities`.
+- `TEMPLATE_SIG_INVALID` — Ed25519 verification of `serverSignature` over `canonicalSerialize(template - sig)` failed.
+- `TEMPLATE_TOO_DEEP` — folder recursion exceeds 32 levels.
+- `TEMPLATE_MALFORMED` — per-file consistency violated: `chunkSize <= 164`, `totalChunks * chunkSize < size`, `manifestKey` empty, etc.
+
+**Operational**:
+
+- `CDN_BAD_SIGNATURE` — chunk fetched from CDN failed Ed25519 sig verification. Drive falls back to mesh.
+- `INLINE_SIG_INVALID` — inline file's stored Ed25519 signature does not match `Ed25519-sign(driveSecretKey, fileId ‖ bytes)`.
+- `KEY_GRANT_REJECTED` — incoming `KeyGrantEnvelope` failed validation: issuer mismatch, recipient mismatch, sig invalid, or expired.
+
+### `type DtpErrorCode`
+
+Union: `(typeof DTP_CODES)[keyof typeof DTP_CODES]`.
+
+### `class DriveTemplateError extends SuaveplanError<DtpErrorCode>`
+
+Constructor: `new DriveTemplateError(code, message, options?)`. Inherits all `SuaveplanError` features.
+
+## Implementation Notes
+
+The eight pipeline codes are ordered by check sequence in `DTP-05`. Implementations MUST throw the first applicable code — they are mutually exclusive in a single hydrate call. The three operational codes are independent: a single drive may emit multiple `CDN_BAD_SIGNATURE` and `INLINE_SIG_INVALID` errors during normal operation; both are observable signals, not blockers.
+
+`KEY_GRANT_REJECTED` is the only error code whose `context` field carries structured detail by convention. Implementations should populate `context` with `{ reason: 'untrusted-issuer' | 'wrong-recipient' | 'bad-signature' | 'expired' }` so callers can branch on the specific failure.
+
+The `error-codes.spec-conformance.test.ts` enforces (1) the registry is frozen, (2) every code value starts with `DTP.`, (3) the eleven names match what the spec requires.