Adds cross-feature integration tests that drive the coordinator the way a real
factory does, asserting the newly-wired paths COMPOSE (the per-feature unit
suites only cover them in isolation):
- retry: fail then auto-requeue then fail again then dead_letter, one claim per attempt;
- chaos: factory dies mid-build, stale reclaim fences the zombie, a late
transition from the dead holder is rejected, survivor claims with a higher
epoch, builds, and ships with the run result/engine recorded;
- no double-assignment under a true claim race;
- expiry reaper recovers a vanished factory's job (requeue + epoch bump + lease expired).
Test-only; deterministic and offline (memory provider, injected time, no network).
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Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
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