Closes#78649. Adds opt-in inbound iMessage catchup that recovers messages landing in chat.db while the gateway is offline (crash, restart, mac sleep). Mirrors the design of the retired BlueBubbles catchup, adapted for the imsg JSON-RPC chats.list + messages.history fetch path.
- Schema: new channels.imessage.catchup block with enabled / maxAgeMinutes (1..720) / perRunLimit (1..500) / firstRunLookbackMinutes (1..720) / maxFailureRetries (1..1000). Disabled by default — opt-in.
- Cursor + replay loop (extensions/imessage/src/monitor/catchup.ts): per-account state under <openclawStateDir>/imessage/catchup/. Walks rows oldest-first, advances on success/give-up, holds at failed.rowid - 1 when a failure is below maxFailureRetries (cannot leapfrog held failures even when later rows in the same batch succeed). Watermark floor for parse-rejected rows.
- Bridge (extensions/imessage/src/monitor/catchup-bridge.ts): live chats.list + per-chat messages.history fetch adapter; dispatch adapter routes through the live handleMessageNow path so allowlists / group policy / dedupe / echo cache behave identically on replayed and live messages. Watermark clamped to last dispatched rowid when the cap truncates.
- Monitor wiring (extensions/imessage/src/monitor/monitor-provider.ts): catchup runs once between watch.subscribe and the live dispatch loop when enabled. Bypasses the inbound debouncer for serial per-row dispatch.
- Echo-cache TTL bumped 2 min → 12 h so own outbound rows from before a gap are not re-fed as inbound on replay.
- Generated bundled-channel-config-metadata.generated.ts so the runtime AJV schema accepts the new catchup block.
- Docs: new "Catching up after gateway downtime" section + BlueBubbles migration parity update.
Tests: 322/322 in extensions/imessage/, including 5 regression tests covering the cursor-leapfrog, parse-rejected stall, watermark vs held failure, and cap-truncation-cursor-floor edge cases that codex (gpt-5.4) and clawsweeper (gpt-5.5) found during review. Live-tested end-to-end against the running gateway: replayed=1 fetchedCount=1, agent reply observed, cursor persisted at the test row's exact rowid.
Co-authored-by: Omar Shahine <10343873+omarshahine@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
