Refactor hooks and worker service for improved error handling and initialization

- Removed try-catch blocks in new-hook, save-hook, and summary-hook for cleaner flow.
- Enhanced error handling in save and summary hooks to throw errors instead of logging and returning.
- Introduced ensureWorkerRunning utility to manage worker service lifecycle and health checks.
- Replaced dynamic port allocation with a fixed port for the worker service.
- Simplified path management and removed unused port allocator utility.
- Added database schema initialization for fresh installations and improved migration handling.

src/hooks/context.ts

@@ -1,8 +1,6 @@
 import path from 'path';
-import { existsSync } from 'fs';
-import { spawn } from 'child_process';
 import { SessionStore } from '../services/sqlite/SessionStore.js';
-import { getWorkerPortFilePath, getPackageRoot } from '../shared/paths.js';
+import { ensureWorkerRunning } from '../shared/worker-utils.js';
 
 export interface SessionStartInput {
   session_id?: string;
@@ -13,61 +11,6 @@ export interface SessionStartInput {
   [key: string]: any;
 }
 
-/**
- * Ensure worker service is running
- * Auto-starts worker if not running (v4.0.0 feature)
- */
-function ensureWorkerRunning(): void {
-  try {
-    const portFile = getWorkerPortFilePath();
-
-    // Check if worker is already running
-    if (existsSync(portFile)) {
-      // Worker appears to be running (port file exists)
-      return;
-    }
-
-    console.error('[claude-mem] Worker not running, starting...');
-
-    // Find worker service path
-    const packageRoot = getPackageRoot();
-    const workerPath = path.join(packageRoot, 'dist', 'worker-service.cjs');
-
-    if (!existsSync(workerPath)) {
-      console.error(`[claude-mem] Worker service not found at ${workerPath}`);
-      return;
-    }
-
-    // Try to start with PM2 first (preferred for production)
-    const ecosystemPath = path.join(packageRoot, 'ecosystem.config.cjs');
-    if (existsSync(ecosystemPath)) {
-      try {
-        spawn('pm2', ['start', ecosystemPath], {
-          detached: true,
-          stdio: 'ignore',
-          cwd: packageRoot
-        }).unref();
-        console.error('[claude-mem] Worker started with PM2');
-        return;
-      } catch (pm2Error) {
-        console.error('[claude-mem] PM2 not available, using direct spawn');
-      }
-    }
-
-    // Fallback: spawn worker directly
-    spawn('node', [workerPath], {
-      detached: true,
-      stdio: 'ignore',
-      env: { ...process.env, NODE_ENV: 'production' }
-    }).unref();
-    console.error('[claude-mem] Worker started in background');
-
-  } catch (error: any) {
-    // Don't fail the hook if worker start fails
-    console.error(`[claude-mem] Failed to start worker: ${error.message}`);
-  }
-}
-
 /**
  * Context Hook - SessionStart
  * Shows user what happened in recent sessions