Standard REST, SSE, and WebSocket endpoints now actively monitor client disconnections. When a connection drop is intercepted, the executing worker task tree is aborted mid-run to prevent background task leaks, API token burn, and resource wastage.
Includes:
1. REST `/run` connection drop monitor blocking on raw ASGI receive events with 0% CPU consumption.
2. Graceful `499 Client Closed Request` status response on REST disconnections to suppress server-side exceptions.
3. Unit and integration tests validating REST task cancellations and generator finalizations.
4. Comprehensive architectural design documents and user guide under `/docs`.
5. An invocation-focused cooperative counting agent sandbox under `/contributing/samples/core/abort`.
Change-Id: I50fcba7a8bb56cf28b0a3bb8fa66b85732062a67
Bo Yang
6a533573db