fix: P1 fixes + TUI dashboard improvements
- StateGraph: checkpoint now saves next node (prevents re-execution on resume)
- Engine: pre-build node_map dict (O(1) lookup, was O(N²))
- Reranker: replace deprecated asyncio.get_event_loop() with get_running_loop()
- Executor: use collections.deque for O(1) popleft (was list.pop(0))
- Dashboard: increase SSH timeouts (8s connect, 15s total), fold long columns,
add macOS RAM detection, wider console (160 cols min)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
L'électron rare
38b62cd2e8