Federation — visible federated reply

nitpub speaks ActivityPub; remote replies are moderated by default.

1. Discoverability — From another Fediverse client, resolve @actor@YOUR_DOMAIN (exact handle from config), not a fuzzy search.
2. Optional preflight — DOMAIN=YOUR_DOMAIN ACTOR=youractor bash scripts/federation-interop-preflight.sh
3. Follow — Follow the nitpub actor from a Mastodon (or compatible) account you control.
4. Publish with federation — Keep cross-post enabled (install gate default, or Admin → Federation). Publish a note from /author/compose so followers receive it.
5. Reply from Mastodon — Reply publicly to that post from your Mastodon account.
6. Make the reply visible — By default inbound replies are pending:
   • Open Admin → Moderation and approve the reply, or
   • Trust the remote actor, or
   • Turn moderation off in Admin → Federation (moderation_enabled = false)
7. Confirm — Open the permalink /p/<slug>#replies and check the reply is shown.

Full checklist and inspect scripts: federation-interop.md. Ops notes: deploy/README.md.