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+# `errors`
+
+Stable error class hierarchy and code registry for
+`@suaveplan/third-party-elevenlabs`. Every non-2xx HTTP response and every
+transport-level failure maps to one of 17 typed `ElevenLabsApiError`
+subclasses under namespace `THIRD_PARTY_ELEVENLABS.*`.
+
+<!-- begin:auto-docs -->
+_(no submodules)_
+<!-- end:auto-docs -->
+
+## Purpose
+
+The ElevenLabs API surface is large and surfaces failures across HTTP status
+codes, malformed JSON bodies, transport timeouts, and WebSocket protocol
+errors. Without a stable error hierarchy, every consumer of this client
+would have to learn the upstream's quirks. This module defines the
+canonical 17-code surface so callers can branch on `error.code` or
+`error instanceof RateLimitExceededError` without touching the wire.
+
+The mapping is total and disjoint over the `[400, 600)` HTTP range, every
+documented network failure mode, every JSON / Zod parse failure, and the
+two WebSocket failure modes (handshake / protocol). Every error preserves
+the original cause via the cause-chain on `SuaveplanError`.
+
+## Features
+
+- 17 error codes registered via `defineCodes('THIRD_PARTY_ELEVENLABS', ...)`.
+- 17 typed subclasses, one per code, with sensible default messages.
+- Convenience options surface common transport context:
+  - `RateLimitExceededError({ retryAfterMs })` — retries planning.
+  - `RequestValidationFailedError({ body })` — preserved 422 body.
+  - `WebSocketConnectionFailedError({ code })` — close code.
+  - `NetworkTimeoutError({ timeoutMs })` — observed limit.
+  - Every HTTP error accepts `{ endpoint, statusCode, requestId }`.
+- Caller-supplied `context` is shallow-merged on top of derived context so
+  adapter packages can layer their own attribution (e.g. `tenantId`).
+
+## Usage: Basic Example
+
+```ts
+import {
+  ElevenLabsApiError,
+  RateLimitExceededError,
+} from "@suaveplan/third-party-elevenlabs/errors/errors";
+
+try {
+  await client.fetchJson(req, schema);
+} catch (err) {
+  if (err instanceof RateLimitExceededError) {
+    console.log(`retry after ${err.context?.retryAfterMs ?? "unknown"} ms`);
+  }
+}
+```
+
+## Usage: Advanced Example
+
+Branch on every documented failure mode and re-throw with adapter context:
+
+```ts
+import {
+  ElevenLabsApiError,
+  ELEVENLABS_CODES,
+} from "@suaveplan/third-party-elevenlabs/errors/errors";
+
+function handleFailure(err: unknown): never {
+  if (!(err instanceof ElevenLabsApiError)) throw err;
+  switch (err.code) {
+    case ELEVENLABS_CODES["AUTH.UNAUTHORIZED"]:
+    case ELEVENLABS_CODES["AUTH.FORBIDDEN"]:
+      throw new ProviderNotConfiguredError({ cause: err });
+    case ELEVENLABS_CODES["RATE_LIMIT.EXCEEDED"]:
+    case ELEVENLABS_CODES["RATE_LIMIT.QUOTA_EXHAUSTED"]:
+      throw new ProviderRateLimitedError({
+        retryAfterMs: err.context?.retryAfterMs as number | undefined,
+        cause: err,
+      });
+    default:
+      throw new TtsSynthesisFailedError({ cause: err });
+  }
+}
+```
+
+## API Reference
+
+- `ELEVENLABS_CODES` — frozen record `{ "<reason>":
+  "THIRD_PARTY_ELEVENLABS.<reason>" }`.
+- `ElevenLabsErrorCode` — TypeScript union of every code value.
+- `ElevenLabsApiError` — abstract base extending `SuaveplanError`.
+
+Auth + request errors:
+
+- `UnauthorizedError({ endpoint?, statusCode?, requestId?, ...base })` —
+  `AUTH.UNAUTHORIZED` (HTTP 401).
+- `ForbiddenError(...)` — `AUTH.FORBIDDEN` (HTTP 403).
+- `RequestInvalidError(...)` — `REQUEST.INVALID` (other 4xx).
+- `RequestValidationFailedError({ body?, ...request })` —
+  `REQUEST.VALIDATION_FAILED` (HTTP 422); body preserved verbatim.
+- `RequestNotFoundError(...)` — `REQUEST.NOT_FOUND` (HTTP 404).
+
+Rate limit:
+
+- `RateLimitExceededError({ retryAfterMs?, ...request })` —
+  `RATE_LIMIT.EXCEEDED` (HTTP 429).
+- `RateLimitQuotaExhaustedError(...)` — `RATE_LIMIT.QUOTA_EXHAUSTED`.
+
+Server:
+
+- `ServerTransientError(...)` — `SERVER.TRANSIENT` (retryable 5xx).
+- `ServerUnavailableError(...)` — `SERVER.UNAVAILABLE` (non-retryable / circuit-open).
+
+Network:
+
+- `NetworkTimeoutError({ endpoint?, timeoutMs?, ...base })` —
+  `NETWORK.TIMEOUT`.
+- `NetworkAbortedError({ endpoint?, ...base })` — `NETWORK.ABORTED`.
+- `NetworkUnreachableError({ endpoint?, ...base })` — `NETWORK.UNREACHABLE`.
+
+Response / stream:
+
+- `ResponseMalformedError({ endpoint?, bodyPreview?, ...base })` —
+  `RESPONSE.MALFORMED`.
+- `ResponseUnsupportedFormatError({ contentType?, ...base })` —
+  `RESPONSE.UNSUPPORTED_FORMAT`.
+- `StreamInterruptedError(...)` — `STREAM.INTERRUPTED`.
+
+WebSocket:
+
+- `WebSocketConnectionFailedError({ code?, ...base })` —
+  `WEBSOCKET.CONNECTION_FAILED`.
+- `WebSocketProtocolError({ code?, ...base })` — `WEBSOCKET.PROTOCOL`.
+
+Every constructor accepts `{ message?, cause?, context?, traceId? }`.
+
+## Implementation Notes
+
+- The 17 codes partition `[400, 600)` HTTP statuses plus three networking
+  modes plus three response / stream modes plus two WebSocket modes. The
+  client never throws a generic `ElevenLabsApiError` — every thrown error
+  is one of the typed subclasses.
+- `RequestValidationFailedError.body` should be the **parsed** JSON body
+  (truncated to a reasonable bound by the client — currently 4 KB; see
+  `client.ts`). Never put raw network buffers here.
+- `bodyPreview` on `ResponseMalformedError` is a short string (≤ 256
+  bytes) suitable for logs. Adapters should not re-serialise the full body
+  into context.
+- All subclasses default to a stable English message. Localisation flows
+  through `MessageResolver` on `@suaveplan/error`.