Refactor worker management and cleanup hooks

- Removed ensureWorkerRunning calls from multiple hooks (cleanup, context, new, save, summary) to streamline code and avoid unnecessary checks.
- Introduced fixed port usage for worker communication across hooks.
- Enhanced error handling in newHook, saveHook, and summaryHook to provide clearer messages for worker connection issues.
- Updated worker service to start without health checks, relying on PM2 for management.
- Cached Claude executable path to optimize repeated calls.
- Improved logging for better traceability of worker actions and errors.

src/hooks/cleanup-hook.ts

@@ -5,7 +5,6 @@
 
 import { stdin } from 'process';
 import { SessionStore } from '../services/sqlite/SessionStore.js';
-import { ensureWorkerRunning } from '../shared/worker-utils.js';
 
 export interface SessionEndInput {
   session_id: string;
@@ -45,12 +44,6 @@ async function cleanupHook(input?: SessionEndInput): Promise<void> {
   const { session_id, reason } = input;
   console.error('[claude-mem cleanup] Searching for active SDK session', { session_id, reason });
 
-  // Ensure worker is running first
-  const workerReady = await ensureWorkerRunning();
-  if (!workerReady) {
-    console.error('[claude-mem cleanup] Worker not available - skipping HTTP cleanup');
-  }
-
   // Find active SDK session
   const db = new SessionStore();
   const session = db.findActiveSDKSession(session_id);