fix(windows): solve zombie port problem with wrapper architecture (#372)

On Windows, Bun doesn't properly release socket handles when the worker
process exits, causing "zombie ports" that remain bound even after all
processes are dead. This required a system reboot to clear.

Solution: Introduce a wrapper process (worker-wrapper.cjs) that:
- Spawns the actual worker as a child with IPC channel
- On restart/shutdown, uses `taskkill /T /F` to kill the entire process tree
- Exits itself, allowing hooks to start fresh

The wrapper has no sockets, so Bun's socket cleanup bug doesn't affect it.
When the wrapper kills the inner worker tree and exits, the port is properly
released and can be immediately reused.

Key changes:
- New worker-wrapper.ts for Windows process lifecycle management
- ProcessManager starts wrapper on Windows, worker directly on Unix
- Worker sends IPC messages to wrapper for restart/shutdown
- Health endpoint now includes debug info (build ID, managed status, hasIpc)

Tested: Restart API now properly releases port and new worker binds to same port.

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

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

scripts/build-hooks.js

@@ -26,6 +26,11 @@ const WORKER_SERVICE = {
   source: 'src/services/worker-service.ts'
 };
 
+const WORKER_WRAPPER = {
+  name: 'worker-wrapper',
+  source: 'src/services/worker-wrapper.ts'
+};
+
 const MCP_SERVER = {
   name: 'mcp-server',
   source: 'src/servers/mcp-server.ts'
@@ -120,6 +125,31 @@ async function buildHooks() {
     const workerStats = fs.statSync(`${hooksDir}/${WORKER_SERVICE.name}.cjs`);
     console.log(`✓ worker-service built (${(workerStats.size / 1024).toFixed(2)} KB)`);
 
+    // Build worker wrapper (Windows zombie port fix)
+    console.log(`\n🔧 Building worker wrapper...`);
+    await build({
+      entryPoints: [WORKER_WRAPPER.source],
+      bundle: true,
+      platform: 'node',
+      target: 'node18',
+      format: 'cjs',
+      outfile: `${hooksDir}/${WORKER_WRAPPER.name}.cjs`,
+      minify: true,
+      logLevel: 'error',
+      external: ['bun:sqlite'],
+      define: {
+        '__DEFAULT_PACKAGE_VERSION__': `"${version}"`
+      },
+      banner: {
+        js: '#!/usr/bin/env bun'
+      }
+    });
+
+    // Make worker wrapper executable
+    fs.chmodSync(`${hooksDir}/${WORKER_WRAPPER.name}.cjs`, 0o755);
+    const wrapperStats = fs.statSync(`${hooksDir}/${WORKER_WRAPPER.name}.cjs`);
+    console.log(`✓ worker-wrapper built (${(wrapperStats.size / 1024).toFixed(2)} KB)`);
+
     // Build MCP server
     console.log(`\n🔧 Building MCP server...`);
     await build({