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Four new per-tier RED canaries prove the server catches failure at every lifecycle tier: - bad-install: custom-html-tiny @ regression-bad-image (4ae88661) nonexistent image → prepull fails → install=fail STAGES=install → no prev-version lookup → chaos deploy of HEAD - bad-upgrade: same branch + SHA, STAGES=install,upgrade install uses prev-version (good image) → PASS upgrade chaos checks out HEAD (bad image) → prepull fails → FAIL - bad-backup: custom-html @ regression-bad-backup (e1e3c5fc) backupbot.backup.path=/nonexistent-path-cc-ci-canary-bad abra app backup create fails → backup=fail - bad-restore: custom-html @ regression-bad-restore (5a481cc1) backup targets .backup-data/ subdir (not where ci-marker.txt lives) backup succeeds; restore puts .backup-data back but NOT the marker marker stays "mutated" → test_restore_returns_state FAILS → restore=fail Each test asserts: rc!=0, failing_tier="fail", prior tiers="pass". Adds @pytest.mark.canary_fast for the fast subset. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>