feat: add Hermes integration panel to Settings → Integrations

Server-side:
- New hermes-integration module (runtime.js + routes.js + tests)
  exposing GET /api/openchamber/hermes/status
- Reports availability of agent-activity, session-steer, and plan-gate
  runtimes plus plan-gate default config
- Wired into feature-routes-runtime.js alongside existing integrations

UI:
- New HermesIntegration.tsx collapsible panel in Integrations page
- Connection status indicator (green/red dot) with 30s polling
- Plan gate default toggle (persists via updateDesktopSettings +
  recordDeferredOpenCodeRestart)
- Read-only status rows for activity stream, steer channel, plan gate
- Server version and uptime display

Settings:
- hermesPlanGateDefault field in settings registry and useUIStore
- Search index entry with keywords: hermes, agent, integration, etc.
- i18n keys for all 12 locales (English text as fallback)

Verification:
- Server tests: 7/7 passed (runtime + routes)
- UI tests: 4/4 passed (HermesIntegration.test.tsx)
- Typecheck: clean (no new errors)
- oxlint: clean on all new/modified files

packages/web/server/index.js

@@ -95,6 +95,7 @@ import { createMessageQueueRuntime } from './lib/message-queue/runtime.js';
 import { createAgentActivityRuntime, registerAgentActivityRoutes } from './lib/agent-activity/runtime.js';
 import { createSessionSteerRuntime, registerSessionSteerRoutes } from './lib/session-steer/runtime.js';
 import { createPlanGateRuntime, registerPlanGateRoutes } from './lib/plan-gate/runtime.js';
+import { createHermesIntegrationRuntime } from './lib/hermes-integration/runtime.js';
 import { createGracefulShutdownRuntime } from './lib/opencode/shutdown-runtime.js';
 import { createProjectConfigRuntime } from './lib/projects/project-config.js';
 import { migrateLegacyUserDirs } from './lib/data-dir-migration.js';
@@ -951,6 +952,14 @@ const planGateRuntime = createPlanGateRuntime({
 });
 planGateRuntime.start();
 
+const hermesIntegrationRuntime = createHermesIntegrationRuntime({
+  agentActivityRuntime,
+  sessionSteerRuntime,
+  planGateRuntime,
+  readSettingsFromDiskMigrated,
+  startedAt: () => Date.now() - (Date.now() - process.uptime() * 1000),
+});
+
 const openCodeWatcherRuntime = createOpenCodeWatcherRuntime({
   waitForOpenCodePort: (...args) => waitForOpenCodePort(...args),
   buildOpenCodeUrl,
@@ -2013,6 +2022,7 @@ async function main(options = {}) {
     agentActivityRuntime,
     sessionSteerRuntime,
     planGateRuntime,
+    hermesIntegrationRuntime,
   });
 
   const startupPipelineResult = await startupPipelineRuntime.run({