Add standalone hook entry points for context, new, save, summary, and worker

- Implemented context-hook.ts for handling session start events.
- Created new-hook.ts for user prompt submission events.
- Developed save-hook.ts for post tool use events.
- Added summary-hook.ts for handling stop events.
- Introduced worker.ts as a standalone background process for the SDK agent.
- Each hook reads input from stdin, processes it, and handles errors gracefully.

src/hooks/new.ts

@@ -48,11 +48,25 @@ export function newHook(input?: UserPromptSubmitInput): void {
     db.close();
 
     // Start SDK worker in background as detached process
-    // Use 'claude-mem worker' CLI command which is always available
-    const child = spawn('claude-mem', ['worker', sessionId.toString()], {
-      detached: true,
-      stdio: 'ignore'
-    });
+    // In plugin mode, use bundled worker; otherwise use global CLI
+    const pluginRoot = process.env.CLAUDE_PLUGIN_ROOT;
+    let child;
+
+    if (pluginRoot) {
+      // Plugin mode: use bundled worker
+      const workerPath = path.join(pluginRoot, 'scripts', 'hooks', 'worker.js');
+      child = spawn('bun', [workerPath, sessionId.toString()], {
+        detached: true,
+        stdio: 'ignore'
+      });
+    } else {
+      // Traditional mode: use global CLI
+      child = spawn('claude-mem', ['worker', sessionId.toString()], {
+        detached: true,
+        stdio: 'ignore'
+      });
+    }
+
     child.unref();
 
     // Output hook response