refactor(worker): Remove file-based locking and improve Windows stability

This commit simplifies worker startup coordination and addresses Windows-specific issues:

**Lock Removal**:
- Removed entire file-based locking system (~100 lines)
- Replaced with health-check-first approach
- Port binding provides natural mutual exclusion - multiple spawns fail cleanly

**Windows Stability**:
- Removed all AbortSignal.timeout() calls to reduce Bun libuv assertion errors
- Added 500ms shutdown delays on Windows to prevent zombie ports
- Worker service has its own timeouts, so client-side timeouts are redundant

**Package.json Updates**:
- Updated worker scripts to use worker-service.cjs directly
- Removed references to deleted worker-cli.js and worker-wrapper.cjs

**Key Changes**:
- src/services/worker-service.ts: Lock removal, shutdown delays, simplified start logic
- src/hooks/*.ts: Removed AbortSignal.timeout from all HTTP requests
- src/shared/worker-utils.ts: Removed AbortSignal.timeout from health checks
- package.json: Updated worker:* scripts

Resolves startup hangs, reduces assertion errors, and prevents zombie port issues.

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

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

package.json

@@ -41,10 +41,10 @@
     "worker:tail": "tail -f 50 ~/.claude-mem/logs/worker-$(date +%Y-%m-%d).log",
     "changelog:generate": "node scripts/generate-changelog.js",
     "discord:notify": "node scripts/discord-release-notify.js",
-    "worker:start": "bun plugin/scripts/worker-cli.js start",
-    "worker:stop": "bun plugin/scripts/worker-cli.js stop",
-    "worker:restart": "bun plugin/scripts/worker-cli.js restart",
-    "worker:status": "bun plugin/scripts/worker-cli.js status",
+    "worker:start": "bun plugin/scripts/worker-service.cjs start",
+    "worker:stop": "bun plugin/scripts/worker-service.cjs stop",
+    "worker:restart": "bun plugin/scripts/worker-service.cjs restart",
+    "worker:status": "bun plugin/scripts/worker-service.cjs status",
     "queue:check": "bun scripts/check-pending-queue.ts",
     "queue:process": "bun scripts/check-pending-queue.ts --process",
     "translate-readme": "bun scripts/translate-readme/cli.ts -v -o docs/i18n README.md",