v0.28.2

Features

• IndexNow generates its verification key automatically when you enable it (#546). Previously the card showed "(not generated yet)" until you clicked "Generate key"; enabling IndexNow now creates the key on the spot, so the card is ready to use immediately. The key is public-by-design (engines fetch it to confirm ownership), so there is nothing to defer. The Regenerate button still rotates it manually.

Docs

• User guide + API reference now document IndexNow. Added §6 "Instant indexing (IndexNow)" subsection to the User Guide (opt-in toggle, verification key, Submit entire catalog now, status line, engine list with Google caveat) plus a §10 troubleshooting entry for HTTP 202 / key-validation issues. Added IndexNow admin routes (POST /regenerate-indexnow-key, POST /indexnow-submit-all, GET /{key}.txt) to the API Reference.