* feat: add end-to-end observability across core, web, and terminal
Instrument lifecycle/API/websocket flows with correlation-aware metrics and operator health surfaces so the system can self-diagnose and escalate failures.
* fix: realign session restore set and unblock claim PR typecheck
* fix(web): restore project-filtered sessions route after main merge
* fix(core): remove unused orchestrator import to unblock lint
* fix(core): always record lifecycle poll failures and remove dead review branches
* fix(web): harden websocket metrics and reuse SSE observers
* fix(web): preserve primary session API errors when services bootstrap fails
* fix(web): use full orchestrator config type in SSE observer helper
* fix(web): restore project-scoped SSE and guard observability error paths
* fix(web): address remaining Bugbot review gaps
* fix(web): align SSE project attribution and share session project resolver
* fix(web): require request arg for SSE route and align tests
* fix(web): record websocket error disconnects as failures
* fix(web): use path alias for session project resolver import
* fix(web): include active connection count in disconnect metrics
Harsh Batheja