feat: close issues through a script

Closing was the last regular tracker operation with no script behind it.
The only way to move state: was a raw `tea api -X PATCH` against
repos/OWNER/REPO/issues/N with a hand-written body, which spells out the
owner, the repo and the request shape — the three things _gitea.py exists
to hide — and which needs a Bash(tea api *) permission wide enough to
cover -X DELETE on the repository.

close.py takes explicit ids, one or many, as a local slug or as any key
form pull.py accepts (42, #42, owner/repo#42, a URL). A slug resolves
through its gitea: field while the file is there and through .remote.json
after push has dropped it, so an issue with no local copy is still
closeable by name. --reopen is the same run backwards.

State only: the payload carries state and nothing else. Closing is not an
edit; editing stays pull -> change -> push --update. No --milestone and
no --label either — which issues are finished is a judgement about
content, and this only carries one out, one named id at a time.

An origin: local issue is refused: it is not in the tracker, so there is
no state there to change, and the error names the id rather than quietly
editing one field of a local file. Every argument is resolved before
anything is sent, so a typo in the third id cannot leave the first two
closed, and one run addresses one repo — a key that names its own is sent
there instead of to whatever repo the CWD happens to be in.

The local file is written only after the tracker confirmed this write: an
object carrying the number that was PATCHed, in the state that was asked
for (close.confirmed). A non-2xx, a transport that would not run, an
answer for another issue, a 200 that still says open — the run stops and
the file is byte for byte what it was. --dry-run prints the same lines,
makes no request at all and needs no pinned login.

tea-runner rule 4 narrows accordingly: closing was forbidden because
nothing but a raw call could do it, not because it is dangerous. It may
now close the ids the caller named, and no others; deleting and retitling
stay forbidden.

tests/test_close.py stubs the transport at _gitea.api and, for the
non-2xx path, one layer lower at _gitea.subprocess so a CLI that exits 1
is proved end to end. 286 tests, no network, no tmp/issues.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

skills/issue/SKILL.md

@@ -117,7 +117,9 @@ the table. Checkboxes are the exception — use `issue_ac.py`, below.
 
 If the issue is synced (`origin: gitea`), the file is a working copy: your edit
 is local until you run `push.py --update` from `/tea:sync`, and that push
-**deletes the file** once Gitea has it. Nothing tracks drift, and with one copy
+**deletes the file** once Gitea has it. Closing one of those is `close.py` from
+`/tea:sync` — it moves the state on both sides in a single run; editing
+`state:` here alone would only ever tell this machine. Nothing tracks drift, and with one copy
 at a time there is little to track — a file that is still here has not been
 pushed. Get it back with `pull.py <n>`; the slug does not change.