- Add process lifecycle diagnostics for dashboard and serve commands
- Add SQLite database health check to diagnostics endpoint
- Add store listener count diagnostics for debugging subscription leaks
- Audit and fix SSE connection management to prevent connection leaks
- Audit and fix timer/interval cleanup in engine and CLI shutdown handlers
- Fix res.on() call guard for test mocks compatibility
- Fix variable declaration ordering in serve.ts
- Update memory with diagnostic findings for future debugging
60aba38816