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345b046a1c
Remove the legacy stack the hexagonal slice replaced, now that nothing assembles it: app/scheduler/service.py (the old orchestration), app/gateway/routers/scheduled_tasks.py (the old dict-returning router, no longer mounted), the deerflow/scheduler package (its cron/timezone rules live in ScheduleSpec), the dict-returning repositories in persistence/scheduled_task*/sql.py, and the deps.py providers and app.state wiring that served them. The ORM rows and the uq_scheduled_task_run_active partial unique index stay -- the table definitions live with the shared engine/alembic infrastructure and the schedule adapters are their only readers and writers. The legacy test suites go with the code they pinned; every scenario has a counterpart in the new suites. The one suite that guarded semantics rather than the old implementation -- the real-database dispatch-race TOCTOU tests -- is migrated to the new stack as test_schedule_dispatch_race.py, driving ScheduleService over the real SQL adapters with the same barrier, natural-timing, and index-semantics cases. Docs and comments that named the old classes as the current wiring (backend/AGENTS.md, reload_boundary.py, channel/service comments) now name the composition-root wiring instead.