Distillation

Date: Sep 15, 2026

• 🔴 [required-concurrency-safety] (12:35) User specified that session recovery must “never start a second owner while the lease is live.”
• 🔴 [required-concurrency-safety] (12:35) User specified that session recovery must “never re-enter its own uncertain live lease.”
• 🟡 (12:35) Frozen patch adds Effect tests named it.effect("never starts a second owner while the lease is live", ...) and it.effect("never re-enters its own uncertain live lease", ...), exercising session wake/claim behavior with first.wake(sessionID), scoped ownership via Scope.make(), and execution identity passed as executionID.
• 🟡 (12:35) Frozen patch modifies packages/core/src/session/runner/publish-llm-event.ts to publish structured session events including SessionEvent.Reasoning.Ended, SessionEvent.Reasoning.Delta, and SessionEvent.Tool.Failed; it tracks assistantMessageID, timestamps, tool ownership, and assistantFailed = true.
• 🟡 (12:35) Frozen runner changes route turn execution through runTurnAttempt(sessionID, executionID, promotion, step, compaction.compactAfterOverflow), preserving the execution lease identity through each attempt.
• 🟡 (12:35) Frozen schema changes add a session_execution table and index session_execution_owner_idx on owner_id.