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9ee22bc6f6
Codex's converge pass found a quiescence-contract violation: a whenIdle() waiter registered for prompt A, then cancel() clears A, then prompt B is queued BEFORE the loop resumes from the idle wait. The window-1 cancel branch called settleIdle() UNCONDITIONALLY, resolving the waiter while B was still queued-and-unrun — whenIdle() resolved with zero events, then B ran afterward. Fix: in window 1, only settleIdle() + re-park when NO new work is queued. If a send() raced in after the cancel, the marker was for the cancelled work only — clear it and fall through to run the new prompt's turn, letting THAT turn's running→idle settle the waiter (so whenIdle() waits for B to actually run). Adds a regression test reproducing the exact interleaving (send A → whenIdle → cancel → send B): whenIdle() now resolves only after B's turn ran (B's user message + a turn/end in the log), and A was dropped.