The unanchored `email-agent` ignore rule matched the `cmd/email-agent/`
directory as well as the root build artifact, so the service entry point was
never committed and a fresh clone could not build. Anchor the rule to the repo
root (`/email-agent`).
This completes the Phase 1.1 tracked tree (AUD-58): entry point, config, SQLite
store, HTTP server, Dockerfile and compose.
Co-Authored-By: Paperclip <noreply@paperclip.ing>
