whats-new

Use to summarize what's new in a repo — recent shipped work AND current codebase state vs. its docs. Triggers on "what's new", "what changed recently", "summarize recent work", "catch me up on this repo". Returns a view (nothing written): history from git log + gh PRs/issues, plus a doc-drift check (do the docs match the code). Not a changelog file — an on-demand summary.