Verify the iOS app

1. Run just test mobile first. That is host swift test in packages/mobile-core, plus the lint from #938.
2. Run monacoctl agents check from apps/backend (go run ./cmd/monacoctl agents check). Read the xcsift TOON output in the check log.
3. When a MonacoTests test fails, rerun only that test with -only-testing:MonacoTests/<Class>/<test>.

Tap through the simulator only when the ticket's Done-when names a visual change or a flow a unit test cannot see. Then use .cursor/skills/ios-simslim-fast-qa/SKILL.md on the simulator from scripts/gold-sim-udid.sh: your worktree's own lane simulator, or the gold one in the primary checkout. Never boot a new simulator for unit tests. Never simctl erase.