A child could pass the early `.start_actor()` guard, miss the `.cancel()` child snapshot and register afterward. Its monitor inherited a reap request without runtime cancellation and could wait forever. - publish child/reap events before sampling `_cancel_called` - make MP abort before `proc.start()` when cancellation won - kill a Trio child opened after cancellation won registration - reject starts begun after nursery cancellation is already visible - add deterministic registration and MP no-start regressions - drop the touched Trio backend's stale `get_runtime_vars` import Prompt-IO: ai/prompt-io/opencode/20260821T040803Z_3c1bbe73_prompt_io.md (this patch was generated in some part by `opencode` using `gpt-5.6-sol` (`openai`)) |
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