fix: memory leaks, race conditions, and stability improvements

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- SSE event listener cleanup: Track all listeners and remove on reconnect
  to prevent listener accumulation (60+ listeners per connect cycle)
- Floating window cleanup: Remove drag listeners, ResizeObservers on close
- Session creation mutex: Prevent race conditions from concurrent requests
- Screen kill verification: Confirm processes are dead after kill signals
- State store circuit breaker: Prevent cascading failures with backup/recovery
- PTY spawn error handling: Wrap all spawn calls with proper error emission
- SSE graceful shutdown: Notify clients before server stops
- Async file writes: Replace blocking writeFileSync in hot paths
- DocumentFragment optimization: Batch DOM updates for plan rendering
- Timer cleanup: Clear notification/countdown timers on SSE reconnect

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

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arkonandClaude Opus 4.5 committed 2026-01-27 20:24:00 +01:00

1 parent de45239fb7

commit e27b473e77

7 files changed

+1624 -313

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