PR closure had no first-class capability: agents could close PRs through
gitea_edit_pr(state=closed) with no close-specific capability proof, and
gitea_resolve_task_capability(close_pr) failed as unknown, leaving the
broad edit path as an untracked close fallback.
Add close_pr to the resolver TASK_MAP (gitea.pr.close, author-side) and
gate gitea_edit_pr(state=closed) on the same operation: without it the
close fails closed before any auth or API call, with reasons and a
structured permission_report; with it the close proceeds and is audited
as a distinct close_pr action carrying the required capability. Reject
invalid state values outright so case variants cannot bypass the gate.
Generalize the profile gate helper (_profile_operation_gate) and document
the PR comment / PR edit / PR close capability split.
Co-Authored-By: Claude Fable 5 <[email protected]>
