T3 — moves claims to ClaimState.REJECTED on 999 AK5 R/E/X.
- New module: src/cyclone/inbox_state.py
- New tests: tests/test_inbox_state.py (4 cases)
- Adds ORM mappings for rejection_reason / rejected_at / resubmit_count
/ state_changed_at on Claim (db.py) — these were added to the
schema by migration 0004 but not yet exposed to the ORM.
Tyler