chore(docs): regenerate api references on the merged tree

The os-regen driver deferred content/docs/references/api/{contract,error-code-ledger}.mdx
during the merge of origin/main. Regenerated from the merged spec source, so the vocabulary
count reflects the UNION of both sides rather than either side's textual +296.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T6HeZvT9wdSJD1ZxJb5Eno

Author: claude

content/docs/references/api/contract.mdx

@@ -27,7 +27,7 @@ const result = ApiErrorSchema.parse(data);
 
 | Property | Type | Required | Description |
 | :--- | :--- | :--- | :--- |
-| **code** | `Enum<'VALIDATION_ERROR' \| 'INVALID_FIELD' \| 'MISSING_REQUIRED_FIELD' \| 'INVALID_FORMAT' \| 'VALUE_TOO_LONG' \| 'VALUE_TOO_SHORT' \| 'VALUE_OUT_OF_RANGE' \| … +296 more>` | ✅ | Error code (e.g. VALIDATION_ERROR; StandardErrorCode ∪ the ledger the serving side registers — ERROR_CODE_LEDGER for framework packages) |
+| **code** | `Enum<'VALIDATION_ERROR' \| 'INVALID_FIELD' \| 'MISSING_REQUIRED_FIELD' \| 'INVALID_FORMAT' \| 'VALUE_TOO_LONG' \| 'VALUE_TOO_SHORT' \| 'VALUE_OUT_OF_RANGE' \| … +297 more>` | ✅ | Error code (e.g. VALIDATION_ERROR; StandardErrorCode ∪ the ledger the serving side registers — ERROR_CODE_LEDGER for framework packages) |
 | **declaredCode** | `string` | optional | The producer-declared code, verbatim, when it is not a member of the closed `code` vocabulary — the open, author-authored channel (app-specific spellings; ADR-0112) |
 | **message** | `string` | ✅ | Readable error message |
 | **userMessage** | `string` | optional | Producer-marked user-facing refusal text, verbatim. Present exactly when the producer opted in at throw time; consumers render it to end users and keep their generic substitution for anything unmarked. Status-agnostic; never replaces `message`. |
@@ -224,6 +224,7 @@ const result = ApiErrorSchema.parse(data);
 * `METADATA_NOT_FOUND`
 * `METADATA_SCHEMA_INVALID`
 * `MULTI_UPDATE_HOOK_KEY_DIVERGENCE`
+* `NAMESPACE_CONFLICT`
 * `NAMESPACE_PREFIX`
 * `NEEDS_PASSWORD`
 * `NODE_FAILURE`

content/docs/references/api/error-code-ledger.mdx

@@ -340,6 +340,7 @@ const result = ErrorCode.parse(data);
 * `METADATA_NOT_FOUND`
 * `METADATA_SCHEMA_INVALID`
 * `MULTI_UPDATE_HOOK_KEY_DIVERGENCE`
+* `NAMESPACE_CONFLICT`
 * `NAMESPACE_PREFIX`
 * `NEEDS_PASSWORD`
 * `NODE_FAILURE`