mm:welcome

Welcome

When receiving /mm:welcome, run:

mirror welcome

Show the user the output verbatim. The welcome is a short, state-aware greeting composed from the database: header, active journey, recent insight or conversation, and a closing invitation.

If the command prints nothing, tell the user: "Nothing to surface right now." Otherwise, do not add commentary — the welcome speaks for itself.

See docs/product/specs/welcome/index.md for the composition rules.