can1357
8b1364d4c2
feat(coding-agent): implemented one-shot generateHandoff in coding-agent
- Replaced event-driven handoff with one-shot `generateHandoff(...)` via `completeSimple`.
- Added cancellable `/handoff` command handling with a loader and Escape-to-abort flow.
- Removed legacy `compaction/handoff.ts` exports and added `generateHandoff(messages, model, apiKey, options)`.
- Fixed pre-cancelled handoff behavior to return `Handoff cancelled` and propagate abort signals.
- Updated handoff tests/mocks to assert `generateHandoff` invocation details and `AgentSession.handoff()` options.