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c38d291505
Replaces the pre-hexagonal scheduled-task implementation with a slice built to the layering spec: a pure domain (two aggregates, two state machines, the policy value object), output ports it declares itself, SQL/launcher/thread adapters implementing them under `app/adapters/`, and a composition root that is the one place any of them is instantiated. The old implementation mixed all of that into `app/scheduler/service.py` and a router that reached straight into repositories, so the rules that matter -- overlap policy, lease handling, which write owns which timestamp -- were only reachable through a live database. They are now unit-assertable on in-memory fakes, with the contract suite running each port against both the fake and real sqlite, and the concurrency invariants pinned by dedicated race tests. Two bugs the old shape hid are fixed on the way: a completion hook that replayed a stale snapshot and rolled back the launch write, and a corrupt stored row surfacing to the client as a 4xx. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>