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fix: fail supervisor runs when a worker dies - #20
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A worker that exits during Supervisor fan-out previously left its token pending forever. The strategy now fails the active run and every queued request with
{:worker_down, worker, reason}, stops surviving workers, and accepts fresh submissions afterward. Late sibling results cannot replace those terminal errors.The workflow guide documents the failure behavior and corrects the synthesizer ordering description. Controlled-backend tests cover three queued tokens, a late sibling result, a sibling that finished before the death, and a successful fresh run.
Validation:
mix format --check-formatted,mix compile --warnings-as-errors,mix credo --strict,mix test(92 passed),mix dialyzer,mix docs --warnings-as-errors, andgit diff --check.Closes #16.