Distillation

Date: Sep 17, 2026

• 🟡 (00:36) Assistant specified the minimal fix for the symmetric Step.Started cancellation boundary: cancellation should adopt the assistant ID already stored on the exact durable execution claim before flushing fragments or publishing interruption, and must not call startAssistant() again for that assistant.
• 🟡 (00:37) The targeted Step.Started cancellation fix modified packages/core/src/session/runner/publish-llm-event.ts, packages/core/src/session/runner/llm.ts, and packages/core/test/session-runner.test.ts.
• 🟡 (00:37) Initial tsgo --noEmit validation failed in packages/core/src/session/runner/publish-llm-event.ts: line 249 used block-scoped assistantMessageID before declaration and before assignment (TS2448, TS2454), while line 251 used it before declaration and attempted assignment to a constant (TS2448, TS2588).
• 🟡 (00:37) Initial tsgo --noEmit validation also failed in packages/core/test/session-runner.test.ts: claim was possibly undefined at lines 4036 and 4043 (TS18048).
• 🟡 (00:37) Follow-up edits addressed the typecheck findings in packages/core/src/session/runner/publish-llm-event.ts and packages/core/test/session-runner.test.ts; no subsequent typecheck or test result was reported.