fix(ci): anchor the release-skip marker to a trailer, and test it

The tagger searched the entire commit message for a bracketed marker as a
substring. The commit that introduced the manifest-bump step described that
marker in its own body — so the tagger read its own documentation as an
instruction and skipped the release. Run 15 reported success with no tag, no
manifest bump and no error. Same failure family as everything else in this
sweep: the wrong thing happened silently.

The rule is now a git trailer matched anchored to its own line, consistent
with Bump-Type, and it lives in bin/should-skip-release rather than untested
inside YAML. tests/release_skip_test.sh pins six cases, including the exact
regression: a message that spells the marker out in prose must still tag.

A marker you cannot mention without triggering is a footgun, not a mechanism.

Bump-Type: patch

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BeAp5LTscnz2W7Ubt4eJ6m

.gitea/workflows/release.yml

@@ -30,8 +30,10 @@ jobs:
         run: |
           set -euo pipefail
           last_commit=$(git log -1 --pretty=%B)
-          if printf '%s' "$last_commit" | grep -qi '\[skip-release\]'; then
-            echo "skipping — commit marked [skip-release]"
+          # Delegated to bin/should-skip-release so the rule is covered by
+          # tests/release_skip_test.sh rather than living untested in YAML.
+          if printf '%s\n' "$last_commit" | sh bin/should-skip-release; then
+            echo "skipping — commit carries the Skip-Release trailer"
             echo "skip=true" >> "$GITHUB_OUTPUT"
             exit 0
           fi
@@ -73,8 +75,8 @@ jobs:
           if [ "$current" != "$version" ]; then
             sed -i "s/\"version\"[[:space:]]*:[[:space:]]*\"$current\"/\"version\": \"$version\"/" "$manifest"
             git add "$manifest"
-            # [skip-release] stops this push from re-triggering the tagger.
-            git commit -m "chore(release): plugin.json version $version [skip-release]"
+            # The trailer below stops this push from re-triggering the tagger.
+            git commit -m "chore(release): plugin.json version $version" -m "Skip-Release: true"
             git push origin HEAD:main
             echo "bumped $manifest to $version"
           fi