fix: publish keeps a closing trailer block of --message last, so git reads Co-Authored-By again (#149)

Files changed:
- CHANGES.md
- VERSION
- tools/CONTRACT.md
- tools/chemenu/commands/git_publish.py
- tools/chemenu/tests/test_git_publish.py

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

tools/CONTRACT.md

@@ -1746,6 +1746,7 @@ Reconcile with `<remote>/<branch>`, then stage all changes, commit, and push.
 - The `--confirm` token covers each counted path, the blob id of its contents and the publish target: a different file list or edited contents need a new clearance.
 - Publish-Remote Gate: when the checkout carries `.wikitool-remotes.json` and the push URL of `--remote` is not listed in it, exits 42 before the reconcile fetches anything. The URL is read with `git remote get-url --push`, so a repointed remote does not pass on its name. An absent file means unrestricted; a malformed one is an error, not permission.
 - `--path` (repeatable) scopes the whole operation - gate count, staging and commit - to that subtree.
+- Commit message: `--message`, then a `Files changed:` paragraph listing every committed path. When `--message` ends in a paragraph git reads as a trailer block (`Co-Authored-By:` and the like), that block stays the last paragraph and the list goes in front of it, since git reads trailers from the last paragraph only. `git interpret-trailers` decides whether there is such a block, and the list moves only when git reads the same trailers from the result; otherwise it is appended at the end. `--message` is not part of any gate token.
 - After a successful commit or push whose changed files include `tools/`, `types/`, `instructions/`, `AGENTS.md` or a path ending in `CONTRACT.md`, prints one reminder line: the phase past this point (an issue-body rewrite, `docs/` staleness, a changelog entry's accuracy) is not covered by `docs verify`, `instructions verify` or `pytest`. It is not a gate: no exit code change, nothing to clear, and silent for an ordinary content publish.
 
 **SEE ALSO**