czlonkowski 1d34ad81d5 feat: implement session persistence for v2.19.0 (Phase 1 + Phase 2) ...

Phase 1 - Lazy Session Restoration (REQ-1, REQ-2, REQ-8):
- Add onSessionNotFound hook for restoring sessions from external storage
- Implement idempotent session creation to prevent race conditions
- Add session ID validation for security (prevent injection attacks)
- Comprehensive error handling (400/408/500 status codes)
- 13 integration tests covering all scenarios

Phase 2 - Session Management API (REQ-5):
- getActiveSessions(): Get all active session IDs
- getSessionState(sessionId): Get session state for persistence
- getAllSessionStates(): Bulk session state retrieval
- restoreSession(sessionId, context): Manual session restoration
- deleteSession(sessionId): Manual session termination
- 21 unit tests covering all API methods

Benefits:
- Sessions survive container restarts
- Horizontal scaling support (no session stickiness needed)
- Zero-downtime deployments
- 100% backwards compatible

Implementation Details:
- Backend methods in http-server-single-session.ts
- Public API methods in mcp-engine.ts
- SessionState type exported from index.ts
- Synchronous session creation and deletion for reliable testing
- Version updated from 2.18.10 to 2.19.0

Tests: 34 passing (13 integration + 21 unit)
Coverage: Full API coverage with edge cases
Security: Session ID validation prevents SQL/NoSQL injection and path traversal

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

2025-10-12 17:25:38 +02:00

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