feat(errors): platform-wide request ids + error codes + admin inspector

End-to-end error-handling overhaul. A user hitting any failure now sees
a plain-text message + stable error code + reference id. A super admin
can paste the id into /admin/errors/<id> for the full request shape,
sanitized body, error stack, and a heuristic likely-cause hint.

REQUEST CONTEXT (AsyncLocalStorage)
- src/lib/request-context.ts mints a per-request frame carrying
  requestId + portId + userId + method + path + start timestamp.
- withAuth wraps every authenticated handler in runWithRequestContext
  and accepts an upstream X-Request-Id header (validated shape) or
  generates a fresh UUID. The id ALWAYS leaves on the X-Request-Id
  response header, including early-return 401/403/4xx paths.
- Pino logger reads from the same context via mixin — every log
  line emitted during the request automatically carries the ids
  with no per-call threading.

ERROR CODE REGISTRY
- src/lib/error-codes.ts defines stable DOMAIN_REASON codes with
  HTTP status + plain-text user-facing message (no jargon, written
  for the rep on the phone with a customer).
- New CodedError class wraps a registered code + optional
  internalMessage (admin-only — never sent to client).
- Existing AppError subclasses got plain-text default rewrites so
  legacy throw sites improve immediately without migration.
- High-impact services migrated to specific codes:
  expenses (RECEIPT_REQUIRED, INVOICE_LINKED), interest-berths
  (CROSS_PORT_LINK_REJECTED), berth-pdf (PDF_MAGIC_BYTE / PDF_EMPTY /
  PDF_TOO_LARGE / VERSION_ALREADY_CURRENT), recommender
  (INTEREST_PORT_MISMATCH).

ERROR ENVELOPE
- errorResponse always sets X-Request-Id header + requestId field.
- 5xx responses include a "Quote error ID …" friendly line.
- 4xx kept clean (validation, permission, not-found don't pollute
  the inspector — they're already in audit log).

PERSISTENCE (error_events table, migration 0040)
- One row per 5xx, keyed on requestId, with method/path/status/error
  name+message/stack head (4KB cap)/sanitized body excerpt (1KB cap;
  password/token/secret/etc keys redacted)/duration/IP/UA/metadata.
- captureErrorEvent extracts Postgres SQLSTATE/severity/cause.code
  so the classifier can recognize FK / unique / NOT NULL / schema-
  drift violations.
- Failure to persist is logged-not-thrown.

LIKELY-CULPRIT CLASSIFIER (src/lib/error-classifier.ts)
- 4-pass heuristic (first match wins):
  1. Postgres SQLSTATE → human reason (23503 FK, 23505 unique,
     42703 schema drift, 53300 connection limit, …)
  2. Error class name (AbortError, TimeoutError, FetchError,
     ZodError)
  3. Stack-path patterns (/lib/storage/, /lib/email/, documenso,
     openai|claude, /queue/workers/)
  4. Free-text message keywords (econnrefused, rate limit, timeout,
     unauthorized|invalid api key)
- Returns { label, hint, subsystem } for the inspector badge.

CLIENT SIDE
- apiFetch throws structured ApiError with message + code + requestId
  + details + retryAfter.
- toastError() helper renders the standard 3-line toast:
  plain message / Error code: X / Reference ID: Y [Copy ID].

ADMIN INSPECTOR
- /<port>/admin/errors lists captured 5xx with status badge + path +
  likely-culprit badge + truncated message + reference id. Filter by
  status code; auto-refresh via TanStack Query.
- /<port>/admin/errors/<requestId> deep-dive: request shape, full
  error name+message+stack, sanitized body excerpt, raw metadata,
  registered-code lookup (so admin can compare to what user saw),
  likely-culprit hint with subsystem tag.
- /<port>/admin/errors/codes is the in-app code reference page —
  every registered code grouped by domain prefix, searchable, with
  HTTP status + user message inline. Linked from inspector header
  so admins can flip to it while triaging.
- Permission: admin.view_audit_log. Super admins see all ports;
  regular admins port-scoped.
- system-monitoring dashboard now surfaces error_events alongside
  permission_denied audit + queue failed jobs (RecentError gains
  source: 'request' variant).

DOCS
- docs/error-handling.md walks through coded errors, plain-text
  message guidelines, client toasting, admin inspector usage,
  persistence rules, classifier internals, pruning, and the
  legacy → CodedError migration path.

MIGRATION SAFETY
- Audit confirmed all 41 migrations (0000-0040) apply cleanly in
  journal order against an empty DB. 0040 references ports(id)
  which exists from 0000. 0035/0038 don't deadlock under sequential
  psql -f. Removed redundant idx_ds_sent_by from 0038 (created in
  0037).

Tests: 1168/1168 vitest passing. tsc clean.
- security-error-responses tests updated for plain-text messages
  + new optional response keys (code/requestId/message).
- berth-pdf-versions tests assert stable error codes via
  toMatchObject({ code }) rather than message regex.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/unit/security-error-responses.test.ts

@@ -7,7 +7,7 @@
  * Rule from SECURITY-GUIDELINES.md:
  *   "Error responses must NEVER contain stack traces, SQL queries, or internal paths"
  */
-import { beforeAll, describe, expect, it, vi } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
 
 // ── Mock next/server before importing the module under test ──────────────────
 // NextResponse is a Next.js runtime class unavailable in a plain Node environment.
@@ -68,12 +68,13 @@ describe('Error response security — AppError subclasses', () => {
     expect(JSON.stringify(body)).not.toContain('node_modules');
   });
 
-  it('NotFoundError returns 404 with generic message, not entity internals', async () => {
+  it('NotFoundError returns 404 with plain-text message, not entity internals', async () => {
     const error = new NotFoundError('Client');
     const response = errorResponse(error);
     expect(response.status).toBe(404);
     const body = await response.json();
-    expect(body.error).toBe('Client not found');
+    // Message is now plain-text user-facing (no jargon, lowercased entity).
+    expect(body.error).toBe("We couldn't find that client. It may have been removed.");
     expect(body.code).toBe('NOT_FOUND');
     expect(JSON.stringify(body)).not.toContain('stack');
   });
@@ -111,9 +112,7 @@ describe('Error response security — AppError subclasses', () => {
 
 describe('Error response security — unknown / native errors', () => {
   it('native Error with SQL content returns generic 500', async () => {
-    const error = new Error(
-      "SELECT * FROM users WHERE id = 1; DROP TABLE users;--",
-    );
+    const error = new Error('SELECT * FROM users WHERE id = 1; DROP TABLE users;--');
     const response = errorResponse(error);
     expect(response.status).toBe(500);
     const body = await response.json();
@@ -135,9 +134,7 @@ describe('Error response security — unknown / native errors', () => {
   });
 
   it('native Error with node_modules path returns generic 500 without path', async () => {
-    const error = new Error(
-      'ENOENT: no such file at /app/node_modules/pg/lib/connection.js',
-    );
+    const error = new Error('ENOENT: no such file at /app/node_modules/pg/lib/connection.js');
     const response = errorResponse(error);
     expect(response.status).toBe(500);
     const body = await response.json();
@@ -233,10 +230,17 @@ describe('Error response security — response shape invariants', () => {
     }
   });
 
-  it('500 response body has exactly the error key and nothing else', async () => {
+  it('500 response body carries error + code (and requestId when in-flight)', async () => {
     const response = errorResponse(new Error('db connection refused'));
     const body = await response.json();
-    expect(Object.keys(body)).toEqual(['error']);
+    // Allowed keys for a 500 response. `code` is always present; `requestId`
+    // and `message` only appear when an active request context is in scope.
+    const allowed = new Set(['error', 'code', 'requestId', 'message']);
+    for (const key of Object.keys(body)) {
+      expect(allowed.has(key)).toBe(true);
+    }
     expect(body.error).toBe('Internal server error');
+    expect(body.code).toBe('INTERNAL');
+    expect(body).not.toHaveProperty('stack');
   });
 });