🐛 fix(ci): version-bump fallback for workflow_dispatch trigger

The CI workflow_dispatch event provides no head_commit, so
${{ github.event.head_commit.message }} expands to empty.
ci-version-bump.sh requires a commit message and exits 1 if absent,
causing manually-triggered CI runs to fail in the version-bump step
even though the actual tests passed.

Fix: fall back to `git log -1 --pretty=%B` when the GitHub event
context provides no commit message. Maintains push-event behavior
unchanged (head_commit.message still primary source).

Observed in CI #615 (manual trigger after PR #28 merge): tests passed,
build OK, but version-bump failed → entire workflow marked FAILURE.

🤖 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci-cd.yaml

@@ -297,7 +297,14 @@ jobs:
           # Check for version bump on main branch
           if [ "${{ github.ref }}" = "refs/heads/main" ]; then
             echo "🔖 Checking for version bump..."
-            ./scripts/ci-version-bump.sh "${{ github.event.head_commit.message }}" --no-push
+            # ${{ github.event.head_commit.message }} is empty on workflow_dispatch (manual trigger).
+            # Fall back to the latest commit message from `git log` so the script always has input.
+            COMMIT_MSG="${{ github.event.head_commit.message }}"
+            if [ -z "$COMMIT_MSG" ]; then
+              COMMIT_MSG=$(git log -1 --pretty=%B)
+              echo "  (using git log -1 because head_commit.message is empty - probably workflow_dispatch)"
+            fi
+            ./scripts/ci-version-bump.sh "$COMMIT_MSG" --no-push
           fi
           
           # Single push for all commits (this is the ONLY push in the entire workflow)