Distillation

Date: Sep 17, 2026

• 🟡 (08:46) Assistant chose a two-layer single-flight interruption design spanning generic SessionRunCoordinator and SessionExecutionLocal: concurrent callers join the same durable cleanup result so they cannot repeat the phase transition, omit cleanup, consume a successor wake, or finalize the coordinator entry early.
• 🟡 (08:46) Initial patch to /home/byk/Code/opencode/packages/core/src/session/execution/local.ts failed because the expected adjacent lines const ownerID = crypto.randomUUID() and const activeClaims = new Map<SessionSchema.ID, SessionExecutionClaim.Claim>() no longer matched; const leaseDuration = Duration.toMillis(SESSION_EXECUTION_LEASE_MS) appears between them at lines 32-34.
• 🟡 (08:46) Single-flight interruption changes were successfully applied to packages/core/src/session/run-coordinator.ts and packages/core/src/session/execution/local.ts.
• 🟡 (08:47) Assistant reported the single-flight coordinator state implemented and added a forced concurrent-interrupt regression in packages/core/test/session-run-coordinator.test.ts.
• 🟡 (08:47) New concurrent-interrupt regression requirements: the second interrupt caller must not execute its own cleanup; both interrupt callers must remain blocked behind the first caller’s cleanup; and a queued wake must start exactly once, only after that cleanup completes. The test includes Fiber.poll(first) and Fiber.poll(second) assertions at lines 405-406 to verify both callers remain pending.
• 🟡 (08:47) packages/core/test/session-run-coordinator.test.ts increased from 463 to 516 lines after adding the concurrent-interrupt regression.