- Remove duplicate `deploy:` block in atomictracker service that
caused YAML parse failure on docker compose up
- Fix yamllint errors: wrap long lines in socket proxy label and
Elasticsearch health check
- Add MAILHOG_SMTP_PORT migration to ensure_env() so older demo.env
files get the new variable appended automatically
- Verified: full stack deploys, 91/91 tests pass (52 unit + 39 e2e),
all 16 services healthy, 13/13 smoke ports accessible
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