fix: Prevent features from getting stuck in in_progress after server restart

- Add graceful shutdown handler that marks running features as 'interrupted'
  before server exit (SIGTERM/SIGINT)
- Add 30-second shutdown timeout to prevent hanging on exit
- Add orphan detection to identify features with missing branches
- Add isFeatureRunning() for idempotent resume checks
- Improve resumeInterruptedFeatures() to handle features without saved context
- Add 'interrupted' status to FeatureStatusWithPipeline type
- Replace console.log with proper logger in auto-mode-service
- Add comprehensive unit tests for all new functionality (15 new tests)

Fixes #696

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/server/src/routes/features/index.ts

@@ -5,6 +5,7 @@
 import { Router } from 'express';
 import { FeatureLoader } from '../../services/feature-loader.js';
 import type { SettingsService } from '../../services/settings-service.js';
+import type { AutoModeService } from '../../services/auto-mode-service.js';
 import type { EventEmitter } from '../../lib/events.js';
 import { validatePathParams } from '../../middleware/validate-paths.js';
 import { createListHandler } from './routes/list.js';
@@ -22,11 +23,16 @@ import { createImportHandler, createConflictCheckHandler } from './routes/import
 export function createFeaturesRoutes(
   featureLoader: FeatureLoader,
   settingsService?: SettingsService,
-  events?: EventEmitter
+  events?: EventEmitter,
+  autoModeService?: AutoModeService
 ): Router {
   const router = Router();
 
-  router.post('/list', validatePathParams('projectPath'), createListHandler(featureLoader));
+  router.post(
+    '/list',
+    validatePathParams('projectPath'),
+    createListHandler(featureLoader, autoModeService)
+  );
   router.post('/get', validatePathParams('projectPath'), createGetHandler(featureLoader));
   router.post(
     '/create',