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- src/sync/: pull with UNION ALL paging and cursor_ahead; push processing of SPEC §14.4.4 steps 1 to 12 in one BEGIN IMMEDIATE with a savepoint per mutation, LWW with delete-wins, tombstones, clock_skew, replay from sync_mutations, sync_batch for more than 3 notifiable changes; 90-day pruning. - src/audit/: SqlAuditWriter and the §14.4.7 diff (now the default in AppState::new). - src/push/: bounded PushHub (100, drop oldest), FCM HTTP v1 client with service-account JWT (RS256, jsonwebtoken on aws-lc-rs) and token cache, sender with 1/5/25 s retries and token clearing; disabled without credentials. - src/tasks/: start installs push and spawns the 06:00 generation (and at start) and 04:00 pruning loops on the injectable clock. - cli: rotate-epoch; serve uses into_make_service_with_connect_info; stale doc comments updated; /i/ empty code gets the HTML 404. - tests: sync_api, push_fcm (local stub of Google's endpoints), scheduler_daily; skeleton routes test now asserts no route is 501. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01TQd3pEP9UeN2uifbHknQ7B