Replace print() with stdout.writeln() (avoid_print lint rule), remove
redundant default argument from _env('CHAOS_SEED') (avoid_redundant_argument_values),
and apply dart format fixes (trailing commas, line wrapping).
Closes#456
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Introduces a headless chaos monkey test that drives the email repository
through 30 rounds of random IMAP/SMTP operations against a live Stalwart
instance to surface crashes and data-corruption bugs.
- test/backend/chaos_monkey_test.dart: random sync, send, flag, delete,
and flush operations; seed logged for reproducibility (CHAOS_SEED env)
- ci/main.go: ChaosMonkeyBackend Dagger function (same pattern as TestBackend)
- Taskfile.yml: chaos-monkey-backend task
- .forgejo/workflows/chaos-monkey.yml: daily cron at 03:00 UTC + workflow_dispatch
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
