chore(ci): gate the release tagger on check + test

The repo had a `task check` structure gate and a 28-case shell test suite
that nothing ever ran. The only workflow auto-tagged every push to main, so
CI reported green having tested nothing — a gate that fails open, and the
reason `mathias/skills` shows up as repository-blocked in the estate backlog
classification.

release.yml becomes ci.yml with two jobs: `gate` runs check + test on every
push and PR; `tag` keeps the existing semver-from-trailer logic but declares
`needs: gate`, so a red check cannot ship a tag. The pull_request trigger
also gives `tbd_ship` a CI run to read on a branch head — without one it
fails closed and never merges (#22).

The tagger now pushes the manifest bump commit and the tag in a single
`git push`. Two pushes left a window where the gate ran `task check` on the
bump commit before the tag existed, and the manifest/tag parity assertion
would fail on a commit that was in fact correct.

tests/ci_gate_test.sh pins the wiring: PR trigger present, both tasks run,
tag needs gate, no second ungated workflow file.

Refs: #22
Bump-Type: minor

.gitea/workflows/ci.yml

@@ -1,23 +1,52 @@
-name: release
+name: CI
 
-# Auto-tag every push to main with a semver bump derived from the latest
-# commit footer:
-#   Bump-Type: major  → vX.0.0
-#   Bump-Type: minor  → v0.Y.0
-#   (default)         → v0.0.Z (patch)
+# Two jobs, in order:
 #
-# Skips when the latest commit is itself the auto-tagger (commit message
-# contains "[skip-release]") to prevent recursion. Tag is pushed back
-# to the repo using the GITEA_TOKEN provided by act_runner.
+#   gate — `task check` (structure, frontmatter, manifest/tag parity) plus
+#          `task test` (hooks, doctor, release-skip). Runs on every push and
+#          every PR. Before this existed the suite ran nowhere: CI reported
+#          green having tested nothing (#22).
+#
+#   tag  — auto-tags a push to main with a semver bump derived from the latest
+#          commit footer:
+#            Bump-Type: major  → vX.0.0
+#            Bump-Type: minor  → v0.Y.0
+#            (default)         → v0.0.Z (patch)
+#          Skips when the commit carries the `Skip-Release: true` trailer (the
+#          tagger's own manifest bump) to prevent recursion. Gated on `gate`,
+#          so a red check cannot ship a tag.
 
-on:
+"on":
   push:
-    branches:
-      - main
+    branches: ["**"]
+  pull_request:
+    branches: [main]
 
 jobs:
-  tag:
+  gate:
+    name: Check / Test
     runs-on: self-hosted
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          # `task check` compares plugin.json's version to `git describe`;
+          # a shallow checkout has no tags and would skip that assertion.
+          fetch-depth: 0
+
+      - name: Verify toolchain
+        run: task --version
+
+      - name: Structure gate
+        run: task check
+
+      - name: Shell test suite
+        run: task test
+
+  tag:
+    name: Tag release
+    needs: gate
+    runs-on: self-hosted
+    if: github.event_name == 'push' && github.ref == 'refs/heads/main'
     steps:
       - name: checkout
         uses: actions/checkout@v4
@@ -72,16 +101,19 @@ jobs:
           manifest=.claude-plugin/plugin.json
           version="${TAG#v}"
           current=$(sed -n 's/.*"version"[[:space:]]*:[[:space:]]*"\([^"]*\)".*/\1/p' "$manifest" | head -1)
+          git tag -a "$TAG" -m "release $TAG"
+
           if [ "$current" != "$version" ]; then
             sed -i "s/\"version\"[[:space:]]*:[[:space:]]*\"$current\"/\"version\": \"$version\"/" "$manifest"
             git add "$manifest"
             # The trailer below stops this push from re-triggering the tagger.
             git commit -m "chore(release): plugin.json version $version" -m "Skip-Release: true"
-            git push origin HEAD:main
+            # Commit and tag go up in ONE push: the gate job runs `task check`
+            # on the bump commit, and that asserts manifest == latest tag. Two
+            # separate pushes leave a window where it legitimately fails.
+            git push origin HEAD:main "$TAG"
             echo "bumped $manifest to $version"
+          else
+            git push origin "$TAG"
           fi
-
-          git tag -a "$TAG" -m "release $TAG"
-          # gitea-actions checkout uses an x-access-token URL; reuse it.
-          git push origin "$TAG"
           echo "pushed $TAG"