chore: release v8.2.1 - worker lifecycle hardening

Critical bug fixes for self-spawn pattern:
- Fix process exit detection in waitForProcessesExit
- Validate spawn PID before writing PID file
- Handle Unix/Windows kill errors in orphan cleanup
- Use /api/readiness for health checks

Refactoring (-580 lines):
- Deleted ProcessManager.ts, worker-cli.ts, worker-wrapper.ts
- Consolidated all lifecycle logic into worker-service.ts

Also: increased timeouts for slow systems, added test suites.

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

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

plugin/.claude-plugin/plugin.json

@@ -1,6 +1,6 @@
 {
   "name": "claude-mem",
-  "version": "8.2.0",
+  "version": "8.2.1",
   "description": "Persistent memory system for Claude Code - seamlessly preserve context across sessions",
   "author": {
     "name": "Alex Newman"