feat(runtime): add production control-plane foundation

apps/api/package.json

@@ -7,7 +7,8 @@
   "scripts": {
     "test": "vitest run --root ../.. apps/api/src",
     "typecheck": "tsc -p tsconfig.json",
-    "canary": "node --experimental-strip-types src/canary-cli.ts"
+    "canary": "node --experimental-strip-types src/canary-cli.ts",
+    "start:production": "node --experimental-strip-types src/production-cli.ts"
   },
   "dependencies": {
     "@multi-simadmin/contracts": "workspace:*",

apps/api/src/app.ts

@@ -1,4 +1,5 @@
-import { randomUUID } from 'node:crypto';
+import { createHash, randomUUID, timingSafeEqual } from 'node:crypto';
+import { GATEWAY_AUTH_HEADER } from './runtime-config.js';
 import type { Writable } from 'node:stream';
 import Fastify, {
   type FastifyInstance,
@@ -12,6 +13,7 @@ export const API_DEFAULT_PORT = 8790 as const;
 const LEGACY_PORT = 8788;
 
 export const REDACT_PATHS = Object.freeze([
+  `req.headers.${GATEWAY_AUTH_HEADER}`,
   'req.headers.authorization',
   'req.headers.cookie',
   'req.headers.x-confirmation-token',
@@ -26,11 +28,24 @@ export interface ReadinessResult {
 }
 
 export interface BuildAppOptions {
+  readonly gatewayToken?: string;
   readonly readiness?: () => ReadinessResult | Promise<ReadinessResult>;
   readonly registerRoutes?: (app: FastifyInstance) => void | Promise<void>;
   readonly logger?: false | { readonly stream?: Writable };
 }
 
+export function secureTokenEqual(
+  supplied: string,
+  expected: string,
+  compare: (
+    actual: NodeJS.ArrayBufferView,
+    expected: NodeJS.ArrayBufferView,
+  ) => boolean = timingSafeEqual,
+): boolean {
+  const digest = (value: string): Buffer => createHash('sha256').update(value, 'utf8').digest();
+  return compare(digest(supplied), digest(expected));
+}
+
 export interface ListenEnvironment {
   readonly API_HOST?: string;
   readonly API_PORT?: string;
@@ -171,10 +186,32 @@ export function buildApp(options: BuildAppOptions = {}): FastifyInstance {
     },
   };
   const app = Fastify(fastifyOptions);
-  const readiness = options.readiness ?? (() => ({ ready: true, checks: { bootstrap: 'ready' } }));
+  const readiness =
+    options.readiness ?? (() => ({ ready: false, checks: { bootstrap: 'unconfigured' } }));
 
   app.addHook('onRequest', async (request, reply) => {
     reply.header('X-Request-Id', request.id);
+    if (options.gatewayToken !== undefined) {
+      const supplied = request.headers[GATEWAY_AUTH_HEADER];
+      const authenticated = secureTokenEqual(
+        typeof supplied === 'string' ? supplied : '',
+        options.gatewayToken,
+      );
+      if (!authenticated) {
+        return reply
+          .code(401)
+          .type('application/problem+json')
+          .send(
+            sendProblem(
+              request,
+              401,
+              'Unauthorized',
+              'GATEWAY_AUTH_REQUIRED',
+              'Trusted gateway authentication is required.',
+            ),
+          );
+      }
+    }
     const host = request.headers.host;
     if (!host || !isLoopbackAuthority(host)) {
       return reply

apps/api/src/canary-cli.ts

@@ -1,24 +1,7 @@
-import { resolve } from 'node:path';
+import { createCanaryGateway } from './canary-gateway.ts';
+import { readCanaryRuntimeOptions } from './canary-runtime.ts';
 
-import {
+const gateway = createCanaryGateway(readCanaryRuntimeOptions(process.env));
-  CANARY_DEFAULT_PORT,
-  CANARY_DEFAULT_UPSTREAM_PORT,
-  createCanaryGateway,
-} from './canary-gateway.ts';
-
-function environmentPort(name: string, fallback: number): number {
-  const value = process.env[name];
-  if (value === undefined || value === '') return fallback;
-  const port = Number(value);
-  if (!Number.isInteger(port)) throw new Error(`${name} must be an integer port`);
-  return port;
-}
-
-const gateway = createCanaryGateway({
-  distDir: resolve(process.env.CANARY_DIST_DIR ?? 'apps/web/dist'),
-  port: environmentPort('CANARY_PORT', CANARY_DEFAULT_PORT),
-  upstreamPort: environmentPort('CANARY_UPSTREAM_PORT', CANARY_DEFAULT_UPSTREAM_PORT),
-});
 
 let stopping = false;
 async function stop(signal: string): Promise<void> {

apps/api/src/canary-gateway.ts

@@ -10,6 +10,7 @@ import {
 } from 'node:http';
 import { extname, isAbsolute, relative, resolve, sep } from 'node:path';
 import { pipeline } from 'node:stream/promises';
+import { GATEWAY_AUTH_HEADER } from './runtime-config.js';
 
 export const CANARY_DEFAULT_HOST = '127.0.0.1';
 export const CANARY_DEFAULT_PORT = 8789;
@@ -55,6 +56,7 @@ function isNumericLoopback(host: string): boolean {
 }
 
 export interface CanaryGatewayOptions {
+  readonly gatewayToken?: string;
   readonly distDir: string;
   readonly host?: string;
   readonly port?: number;
@@ -87,6 +89,16 @@ function withoutHopByHop(headers: IncomingHttpHeaders): IncomingHttpHeaders {
   );
 }
 
+function trustedUpstreamHeaders(
+  headers: IncomingHttpHeaders,
+  gatewayToken: string | undefined,
+): IncomingHttpHeaders {
+  const sanitized = withoutHopByHop(headers);
+  delete sanitized[GATEWAY_AUTH_HEADER];
+  if (gatewayToken !== undefined) sanitized[GATEWAY_AUTH_HEADER] = gatewayToken;
+  return sanitized;
+}
+
 function isProxyPath(pathname: string): boolean {
   return pathname === '/healthz' || pathname === '/readyz' || pathname.startsWith('/api/v1/');
 }
@@ -114,6 +126,7 @@ async function proxyRequest(
   response: ServerResponse,
   upstreamHost: string,
   upstreamPort: number,
+  gatewayToken: string | undefined,
 ): Promise<void> {
   await new Promise<void>((resolvePromise) => {
     const upstream = httpRequest(
@@ -122,7 +135,7 @@ async function proxyRequest(
         port: upstreamPort,
         method: incoming.method,
         path: incoming.url,
-        headers: withoutHopByHop(incoming.headers),
+        headers: trustedUpstreamHeaders(incoming.headers, gatewayToken),
       },
       (upstreamResponse) => {
         response.writeHead(
@@ -235,7 +248,7 @@ export function createCanaryGateway(options: CanaryGatewayOptions): CanaryGatewa
     }
 
     if (isProxyPath(pathname)) {
-      await proxyRequest(request, response, upstreamHost, upstreamPort);
+      await proxyRequest(request, response, upstreamHost, upstreamPort, options.gatewayToken);
       return;
     }
     if (pathname.startsWith('/api')) return sendText(response, 404, 'Not Found');
@@ -245,7 +258,11 @@ export function createCanaryGateway(options: CanaryGatewayOptions): CanaryGatewa
 
     const distRoot = await realpath(resolve(options.distDir)).catch(() => resolve(options.distDir));
     if (pathname !== '/' && (await serveFile(request, response, distRoot, pathname))) return;
-    if (!(await serveFile(request, response, distRoot, '/index.html'))) {
+    if (
+      pathname.startsWith('/assets/') ||
+      extname(pathname) !== '' ||
+      !(await serveFile(request, response, distRoot, '/index.html'))
+    ) {
       sendText(response, 404, 'Not Found');
     }
   }

apps/api/src/canary-runtime.ts

@@ -0,0 +1,43 @@
+import { resolve } from 'node:path';
+import {
+  CANARY_DEFAULT_PORT,
+  CANARY_DEFAULT_UPSTREAM_PORT,
+  type CanaryGatewayOptions,
+} from './canary-gateway.js';
+
+export interface CanaryRuntimeEnvironment {
+  readonly CANARY_DIST_DIR?: string;
+  readonly CANARY_PORT?: string;
+  readonly CANARY_UPSTREAM_PORT?: string;
+  readonly MULTI_SIMADMIN_GATEWAY_TOKEN?: string;
+}
+
+function environmentPort(value: string | undefined, name: string, fallback: number): number {
+  if (value === undefined || value === '') return fallback;
+  const port = Number(value);
+  if (!Number.isInteger(port) || port < 1 || port > 65_535)
+    throw new Error(`${name} must be an integer port`);
+  return port;
+}
+
+export function readCanaryRuntimeOptions(
+  environment: CanaryRuntimeEnvironment,
+): CanaryGatewayOptions {
+  const gatewayToken = environment.MULTI_SIMADMIN_GATEWAY_TOKEN;
+  if (
+    !gatewayToken ||
+    Buffer.byteLength(gatewayToken) < 32 ||
+    Buffer.byteLength(gatewayToken) > 512
+  )
+    throw new Error('Gateway token must contain between 32 and 512 bytes');
+  return Object.freeze({
+    distDir: resolve(environment.CANARY_DIST_DIR ?? 'apps/web/dist'),
+    port: environmentPort(environment.CANARY_PORT, 'CANARY_PORT', CANARY_DEFAULT_PORT),
+    upstreamPort: environmentPort(
+      environment.CANARY_UPSTREAM_PORT,
+      'CANARY_UPSTREAM_PORT',
+      CANARY_DEFAULT_UPSTREAM_PORT,
+    ),
+    gatewayToken,
+  });
+}

apps/api/src/production-cli.ts

@@ -0,0 +1,19 @@
+import { buildProductionControlPlane } from './production-control-plane.ts';
+import { createRuntimeConfig } from './runtime-config.ts';
+import { installBoundedShutdown } from './shutdown.ts';
+
+try {
+  const config = createRuntimeConfig(process.env);
+  const app = buildProductionControlPlane({
+    databasePath: config.databasePath,
+    gatewayToken: config.gatewayToken,
+  });
+  await app.listen(config.api);
+  installBoundedShutdown(process, app, {
+    terminate: () => process.exit(1),
+  });
+  process.stdout.write(`API listening at http://${config.api.host}:${config.api.port}\n`);
+} catch (error) {
+  process.stderr.write(`${error instanceof Error ? error.message : String(error)}\n`);
+  process.exitCode = 1;
+}

apps/api/src/production-control-plane.ts

@@ -9,11 +9,14 @@ import { migrateDatabase } from './infrastructure/database/migrations.js';
 import { MacOSKeychainSecretStore } from './infrastructure/secrets/keychain-secret-store.js';
 import type { SecretStore } from './infrastructure/secrets/secret-store.js';
 import { createProductionUpstream } from './infrastructure/transport/production-upstream.js';
+import { createProductionReadiness, defaultKeychainMetadataCheck } from './production-readiness.js';
 
 export interface ProductionControlPlaneOptions {
   readonly databasePath: string;
   readonly store?: SecretStore;
   readonly upstream?: SafeControlPlaneUpstream;
+  readonly gatewayToken?: string;
+  readonly keychainMetadataCheck?: () => boolean | Promise<boolean>;
 }
 
 export function buildProductionControlPlane(
@@ -29,11 +32,20 @@ export function buildProductionControlPlane(
   const db = openDatabase(options.databasePath);
   try {
     migrateDatabase(db);
+    const store = options.store ?? new MacOSKeychainSecretStore();
     const app = buildControlPlaneApp({
       db,
-      store: options.store ?? new MacOSKeychainSecretStore(),
+      store,
       upstream: options.upstream ?? createProductionUpstream(),
-      app: { logger: {} },
+      app: {
+        logger: {},
+        ...(options.gatewayToken ? { gatewayToken: options.gatewayToken } : {}),
+        readiness: createProductionReadiness({
+          db,
+          gatewayToken: options.gatewayToken ?? '',
+          keychainMetadataCheck: options.keychainMetadataCheck ?? defaultKeychainMetadataCheck,
+        }),
+      },
     });
     app.addHook('onClose', async () => {
       if (db.open) db.close();

apps/api/src/production-readiness.ts

@@ -0,0 +1,62 @@
+import type Database from 'better-sqlite3';
+import { stat as fsStat } from 'node:fs/promises';
+import { MIGRATIONS } from './infrastructure/database/migrations.js';
+import type { ReadinessResult } from './app.js';
+
+export interface ProductionReadinessOptions {
+  readonly db: Database.Database;
+  readonly gatewayToken: string;
+  /** Metadata/availability probe only. This callback must never retrieve a secret. */
+  readonly keychainMetadataCheck: () => boolean | Promise<boolean>;
+}
+interface ExecutableMetadata {
+  isFile(): boolean;
+  readonly mode: number;
+}
+export async function defaultKeychainMetadataCheck(
+  platform: NodeJS.Platform = process.platform,
+  stat: (path: string) => Promise<ExecutableMetadata> = fsStat,
+): Promise<boolean> {
+  if (platform !== 'darwin') return false;
+  try {
+    const metadata = await stat('/usr/bin/security');
+    return metadata.isFile() && (metadata.mode & 0o111) !== 0;
+  } catch {
+    return false;
+  }
+}
+export function createProductionReadiness(
+  options: ProductionReadinessOptions,
+): () => Promise<ReadinessResult> {
+  return async () => {
+    const checks: Record<string, string> = {};
+    let ready = true;
+    try {
+      options.db.prepare('SELECT 1').get();
+      checks.database = 'ready';
+    } catch {
+      checks.database = 'unavailable';
+      ready = false;
+    }
+    try {
+      const expected = MIGRATIONS.at(-1)?.id ?? 0;
+      const row = options.db.prepare('SELECT MAX(id) AS id FROM schema_migrations').get() as {
+        id: number | null;
+      };
+      checks.migrations = row.id === expected ? 'ready' : 'pending';
+      if (row.id !== expected) ready = false;
+    } catch {
+      checks.migrations = 'unavailable';
+      ready = false;
+    }
+    checks.gatewayAuth = Buffer.byteLength(options.gatewayToken) >= 32 ? 'ready' : 'unconfigured';
+    if (checks.gatewayAuth !== 'ready') ready = false;
+    try {
+      checks.keychain = (await options.keychainMetadataCheck()) ? 'ready' : 'unavailable';
+    } catch {
+      checks.keychain = 'unavailable';
+    }
+    if (checks.keychain !== 'ready') ready = false;
+    return { ready, checks };
+  };
+}

apps/api/src/runtime-config.ts

@@ -0,0 +1,71 @@
+import { realpathSync } from 'node:fs';
+import { dirname, isAbsolute, relative, resolve, sep } from 'node:path';
+
+export const GATEWAY_AUTH_HEADER = 'x-multi-simadmin-gateway-token' as const;
+export interface RuntimeEnvironment {
+  readonly MULTI_SIMADMIN_DATA_ROOT?: string;
+  readonly MULTI_SIMADMIN_DATABASE_PATH?: string;
+  readonly MULTI_SIMADMIN_GATEWAY_TOKEN?: string;
+  readonly API_HOST?: string;
+  readonly API_PORT?: string;
+}
+export interface RuntimeConfig {
+  readonly api: { readonly host: '127.0.0.1'; readonly port: 8790 };
+  readonly dataRoot: string;
+  readonly databasePath: string;
+  readonly gatewayToken: string;
+}
+function within(root: string, candidate: string): boolean {
+  const child = relative(root, candidate);
+  return child !== '..' && !child.startsWith(`..${sep}`) && !isAbsolute(child);
+}
+function canonicalExistingAncestor(path: string): string {
+  let existing = path;
+  const suffix: string[] = [];
+  for (;;) {
+    try {
+      return resolve(realpathSync(existing), ...suffix);
+    } catch (error) {
+      if ((error as NodeJS.ErrnoException).code !== 'ENOENT') throw error;
+      const parent = dirname(existing);
+      if (parent === existing) throw error;
+      suffix.unshift(existing.slice(parent.length + (parent.endsWith(sep) ? 0 : 1)));
+      existing = parent;
+    }
+  }
+}
+export function createRuntimeConfig(environment: RuntimeEnvironment): RuntimeConfig {
+  if (environment.API_HOST !== undefined && environment.API_HOST !== '127.0.0.1')
+    throw new Error('API host is fixed at 127.0.0.1');
+  if (environment.API_PORT !== undefined && environment.API_PORT !== '8790')
+    throw new Error('API port is fixed at 8790');
+  const rootInput = environment.MULTI_SIMADMIN_DATA_ROOT;
+  const databaseInput = environment.MULTI_SIMADMIN_DATABASE_PATH;
+  if (!rootInput || !isAbsolute(rootInput))
+    throw new Error('An explicit absolute local app data root is required');
+  if (!databaseInput || !isAbsolute(databaseInput))
+    throw new Error('An explicit absolute SQLite database path is required');
+  const dataRoot = resolve(rootInput);
+  const databasePath = resolve(databaseInput);
+  if (!within(dataRoot, databasePath) || databasePath === dataRoot)
+    throw new Error('Database path must be within the local app data root');
+  const canonicalRoot = canonicalExistingAncestor(dataRoot);
+  const canonicalDatabase = canonicalExistingAncestor(databasePath);
+  if (!within(canonicalRoot, canonicalDatabase) || canonicalDatabase === canonicalRoot)
+    throw new Error(
+      'Database path must remain within the local app data root after resolving symlinks',
+    );
+  const gatewayToken = environment.MULTI_SIMADMIN_GATEWAY_TOKEN;
+  if (
+    !gatewayToken ||
+    Buffer.byteLength(gatewayToken) < 32 ||
+    Buffer.byteLength(gatewayToken) > 512
+  )
+    throw new Error('Gateway token must contain at least 32 bytes');
+  return Object.freeze({
+    api: Object.freeze({ host: '127.0.0.1' as const, port: 8790 as const }),
+    dataRoot,
+    databasePath,
+    gatewayToken,
+  });
+}

apps/api/src/runtime-foundation.test.ts

@@ -0,0 +1,191 @@
+import { EventEmitter } from 'node:events';
+import { lstat, mkdtemp, mkdir, rm, symlink, writeFile } from 'node:fs/promises';
+import { createServer } from 'node:http';
+import { tmpdir } from 'node:os';
+import { join, resolve } from 'node:path';
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { createRuntimeConfig, GATEWAY_AUTH_HEADER } from './runtime-config.js';
+import { buildApp } from './app.js';
+import { createCanaryGateway, type CanaryGateway } from './canary-gateway.js';
+import { createProductionReadiness } from './production-readiness.js';
+import { defaultKeychainMetadataCheck } from './production-readiness.js';
+import { readCanaryRuntimeOptions } from './canary-runtime.js';
+import { installBoundedShutdown } from './shutdown.js';
+import { secureTokenEqual } from './app.js';
+import { openDatabase } from './infrastructure/database/database.js';
+import { migrateDatabase } from './infrastructure/database/migrations.js';
+
+const cleanup: Array<() => Promise<void>> = [];
+afterEach(async () => {
+  await Promise.all(cleanup.splice(0).map((fn) => fn()));
+});
+const token = 'runtime-gateway-token-with-at-least-32-bytes';
+
+describe('production runtime foundation', () => {
+  it('creates one deeply immutable fixed-listener config and validates before side effects', () => {
+    const root = resolve('/tmp/multi-simadmin-data');
+    const config = createRuntimeConfig({
+      MULTI_SIMADMIN_DATA_ROOT: root,
+      MULTI_SIMADMIN_DATABASE_PATH: join(root, 'db.sqlite'),
+      MULTI_SIMADMIN_GATEWAY_TOKEN: token,
+      API_HOST: '127.0.0.1',
+      API_PORT: '8790',
+    });
+    expect(config).toEqual({
+      api: { host: '127.0.0.1', port: 8790 },
+      dataRoot: root,
+      databasePath: join(root, 'db.sqlite'),
+      gatewayToken: token,
+    });
+    expect(Object.isFrozen(config)).toBe(true);
+    expect(Object.isFrozen(config.api)).toBe(true);
+    expect(() =>
+      createRuntimeConfig({
+        MULTI_SIMADMIN_DATA_ROOT: root,
+        MULTI_SIMADMIN_DATABASE_PATH: '/tmp/escape.sqlite',
+        MULTI_SIMADMIN_GATEWAY_TOKEN: token,
+      }),
+    ).toThrow(/data root/i);
+    expect(() =>
+      createRuntimeConfig({
+        MULTI_SIMADMIN_DATA_ROOT: root,
+        MULTI_SIMADMIN_DATABASE_PATH: join(root, 'db.sqlite'),
+        MULTI_SIMADMIN_GATEWAY_TOKEN: 'weak',
+      }),
+    ).toThrow(/token/i);
+  });
+
+  it('rejects a database path whose existing symlink ancestor escapes before creating a DB', async () => {
+    const directory = await mkdtemp(join(tmpdir(), 'runtime-containment-'));
+    cleanup.push(() => rm(directory, { recursive: true, force: true }));
+    const root = join(directory, 'data');
+    const outside = join(directory, 'outside');
+    await mkdir(root);
+    await mkdir(outside);
+    await symlink(outside, join(root, 'escape'));
+    const databasePath = join(root, 'escape', 'db.sqlite');
+
+    expect(() =>
+      createRuntimeConfig({
+        MULTI_SIMADMIN_DATA_ROOT: root,
+        MULTI_SIMADMIN_DATABASE_PATH: databasePath,
+        MULTI_SIMADMIN_GATEWAY_TOKEN: token,
+      }),
+    ).toThrow(/data root|symlink/i);
+    await expect(lstat(join(outside, 'db.sqlite'))).rejects.toMatchObject({ code: 'ENOENT' });
+  });
+
+  it('reads and validates the canary gateway token from its environment', () => {
+    expect(
+      readCanaryRuntimeOptions({
+        MULTI_SIMADMIN_GATEWAY_TOKEN: token,
+        CANARY_DIST_DIR: '/tmp/dist',
+        CANARY_PORT: '8789',
+        CANARY_UPSTREAM_PORT: '8790',
+      }),
+    ).toMatchObject({ gatewayToken: token, port: 8789, upstreamPort: 8790 });
+    expect(() => readCanaryRuntimeOptions({ CANARY_DIST_DIR: '/tmp/dist' })).toThrow(/token/i);
+    expect(() =>
+      readCanaryRuntimeOptions({
+        CANARY_DIST_DIR: '/tmp/dist',
+        MULTI_SIMADMIN_GATEWAY_TOKEN: 'weak',
+      }),
+    ).toThrow(/token/i);
+  });
+
+  it('always compares fixed-size token digests with timingSafeEqual', () => {
+    const compare = vi.fn(() => false);
+    expect(secureTokenEqual('x', token, compare)).toBe(false);
+    expect(compare).toHaveBeenCalledOnce();
+    const [actual, expected] = compare.mock.calls[0] as unknown as [Buffer, Buffer];
+    expect(actual).toHaveLength(32);
+    expect(expected).toHaveLength(32);
+  });
+
+  it('forces pluggable termination when graceful shutdown exceeds its deadline', async () => {
+    vi.useFakeTimers();
+    const target = new EventEmitter();
+    const terminate = vi.fn();
+    const stop = installBoundedShutdown(
+      target,
+      { close: () => new Promise(() => undefined) },
+      { timeoutMs: 25, terminate },
+    );
+    const stopping = stop();
+    await vi.advanceTimersByTimeAsync(25);
+    await stopping;
+    expect(terminate).toHaveBeenCalledOnce();
+    vi.useRealTimers();
+  });
+
+  it('default Keychain readiness checks only Darwin security executable metadata', async () => {
+    const stat = vi.fn(async () => ({ isFile: () => true, mode: 0o100755 }));
+    await expect(defaultKeychainMetadataCheck('darwin', stat)).resolves.toBe(true);
+    expect(stat).toHaveBeenCalledExactlyOnceWith('/usr/bin/security');
+    stat.mockClear();
+    await expect(defaultKeychainMetadataCheck('linux', stat)).resolves.toBe(false);
+    expect(stat).not.toHaveBeenCalled();
+  });
+
+  it('authenticates internal requests without reflecting credentials', async () => {
+    const app = buildApp({ gatewayToken: token });
+    cleanup.push(() => app.close());
+    expect((await app.inject({ url: '/healthz' })).statusCode).toBe(401);
+    expect(
+      (
+        await app.inject({
+          url: '/healthz',
+          headers: { [GATEWAY_AUTH_HEADER]: 'wrong-but-same-length-xxxxxxxxxxxxxxxxx' },
+        })
+      ).statusCode,
+    ).toBe(401);
+    const ok = await app.inject({ url: '/healthz', headers: { [GATEWAY_AUTH_HEADER]: token } });
+    expect(ok.statusCode).toBe(200);
+    expect(ok.payload).not.toContain(token);
+  });
+
+  it('readiness checks a live migrated DB and auth configuration without reading secrets', async () => {
+    const directory = await mkdtemp(join(tmpdir(), 'runtime-ready-'));
+    cleanup.push(() => rm(directory, { recursive: true, force: true }));
+    const db = openDatabase(join(directory, 'db.sqlite'));
+    migrateDatabase(db);
+    const keychainMetadataCheck = vi.fn(async () => true);
+    const readiness = createProductionReadiness({ db, gatewayToken: token, keychainMetadataCheck });
+    expect(await readiness()).toEqual({
+      ready: true,
+      checks: { database: 'ready', migrations: 'ready', gatewayAuth: 'ready', keychain: 'ready' },
+    });
+    expect(keychainMetadataCheck).toHaveBeenCalledOnce();
+    db.close();
+    expect((await readiness()).ready).toBe(false);
+  });
+
+  it('gateway replaces forged auth and only falls back for extensionless routes', async () => {
+    const directory = await mkdtemp(join(tmpdir(), 'runtime-gateway-'));
+    await mkdir(join(directory, 'assets'));
+    await writeFile(join(directory, 'index.html'), '<main>SPA</main>');
+    cleanup.push(() => rm(directory, { recursive: true, force: true }));
+    let seen: string | string[] | undefined;
+    const upstream = createServer((request, response) => {
+      seen = request.headers[GATEWAY_AUTH_HEADER];
+      response.end('ok');
+    });
+    await new Promise<void>((done) => upstream.listen(0, '127.0.0.1', done));
+    cleanup.push(() => new Promise<void>((done) => upstream.close(() => done())));
+    const address = upstream.address();
+    if (!address || typeof address === 'string') throw new Error('address');
+    const gateway: CanaryGateway = createCanaryGateway({
+      distDir: directory,
+      port: 0,
+      upstreamPort: address.port,
+      gatewayToken: token,
+    });
+    await gateway.start();
+    cleanup.push(() => gateway.stop());
+    await fetch(`${gateway.origin}/healthz`, { headers: { [GATEWAY_AUTH_HEADER]: 'forged' } });
+    expect(seen).toBe(token);
+    expect((await fetch(`${gateway.origin}/assets/missing.js`)).status).toBe(404);
+    expect((await fetch(`${gateway.origin}/missing.css`)).status).toBe(404);
+    expect((await fetch(`${gateway.origin}/instances/one`)).status).toBe(200);
+  });
+});

apps/api/src/shutdown.ts

@@ -0,0 +1,37 @@
+export interface ClosableRuntime {
+  close(): Promise<void>;
+}
+export interface SignalTarget {
+  once(event: 'SIGINT' | 'SIGTERM', listener: () => void): unknown;
+  removeListener(event: 'SIGINT' | 'SIGTERM', listener: () => void): unknown;
+}
+export function installBoundedShutdown(
+  target: SignalTarget,
+  runtime: ClosableRuntime,
+  options: { readonly timeoutMs?: number; readonly terminate?: () => void } = {},
+): () => Promise<void> {
+  let shutdown: Promise<void> | undefined;
+  const timeoutMs = options.timeoutMs ?? 5_000;
+  const stop = (): Promise<void> => {
+    if (shutdown) return shutdown;
+    let timeout: ReturnType<typeof setTimeout> | undefined;
+    const deadline = new Promise<void>((resolve) => {
+      timeout = setTimeout(() => {
+        options.terminate?.();
+        resolve();
+      }, timeoutMs);
+    });
+    shutdown = Promise.race([runtime.close(), deadline]).finally(() => {
+      if (timeout !== undefined) clearTimeout(timeout);
+      target.removeListener('SIGINT', listener);
+      target.removeListener('SIGTERM', listener);
+    });
+    return shutdown;
+  };
+  const listener = (): void => {
+    void stop();
+  };
+  target.once('SIGINT', listener);
+  target.once('SIGTERM', listener);
+  return stop;
+}

apps/api/src/start.ts

@@ -1,9 +1,11 @@
 import { createListenOptions, type ListenEnvironment } from './app.js';
 import { buildProductionControlPlane } from './production-control-plane.js';
+import { createRuntimeConfig, type RuntimeEnvironment } from './runtime-config.js';
 
 export interface StartApiOptions {
   readonly environment?: ListenEnvironment;
   readonly databasePath?: string;
+  readonly runtimeEnvironment?: RuntimeEnvironment;
   readonly app?: {
     listen(options: { readonly host: string; readonly port: number }): Promise<string>;
     close(): Promise<void>;
@@ -12,9 +14,16 @@ export interface StartApiOptions {
 }
 
 export async function startApi(options: StartApiOptions = {}): Promise<void> {
-  const listenOptions = createListenOptions(options.environment ?? {});
+  const runtime = options.runtimeEnvironment
+    ? createRuntimeConfig(options.runtimeEnvironment)
+    : undefined;
+  const listenOptions = runtime?.api ?? createListenOptions(options.environment ?? {});
   const app =
-    options.app ?? buildProductionControlPlane({ databasePath: options.databasePath ?? '' });
+    options.app ??
+    buildProductionControlPlane({
+      databasePath: runtime?.databasePath ?? options.databasePath ?? '',
+      ...(runtime ? { gatewayToken: runtime.gatewayToken } : {}),
+    });
   try {
     await app.listen(listenOptions);
   } catch (listenError) {

apps/api/tsconfig.json

@@ -5,5 +5,5 @@
     "types": ["node"]
   },
   "include": ["src/**/*.ts"],
-  "exclude": ["src/canary-cli.ts"]
+  "exclude": ["src/canary-cli.ts", "src/production-cli.ts"]
 }