fix: revert conventional-changelog-action to v5 due to tag detection bug

- Keep actions/checkout@v6 (works correctly)
- Revert conventional-changelog-action v6 -> v5
- Restore skip-commit: false (v6 has tag detection issues with skip options)
- Restore git --amend workflow (compatible with v5)

Root cause: v6 fails to detect existing tags (v1.2.0-v1.4.0) when skip-commit
is enabled, causing it to calculate version from v1.0.0 instead of v1.4.0.
Related: https://github.com/TriPSs/conventional-changelog-action/issues/280

.github/workflows/automated-release.yml

@@ -33,7 +33,7 @@ jobs:
       # - Git commit and push
       - name: Conventional Changelog Action
         id: changelog
-        uses: TriPSs/conventional-changelog-action@v6
+        uses: TriPSs/conventional-changelog-action@v5
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           git-message: 'chore(release): {version}'
@@ -46,15 +46,14 @@ jobs:
           version-path: 'version'
           skip-on-empty: 'false'
           skip-version-file: 'false'
-          skip-commit: 'true'
-          skip-tag: 'true'
+          skip-commit: 'false'
 
       # 2b. Sync plugin version, SKILL.md version, and git ref
       # This ensures all three version fields stay synchronized:
       # - root version (updated by conventional-changelog-action above)
       # - plugins[0].version (synced here)
       # - SKILL.md metadata.version (synced here)
-      - name: Sync and Commit Release
+      - name: Sync Plugin Version and SKILL.md
         if: steps.changelog.outputs.skipped == 'false'
         env:
           VERSION: ${{ steps.changelog.outputs.version }}
@@ -131,17 +130,12 @@ jobs:
               sys.exit(1)
           EOF
 
-          # Commit all changes (CHANGELOG, marketplace.json, SKILL.md) together
+          # Commit the sync
           git config user.name "github-actions[bot]"
           git config user.email "github-actions[bot]@users.noreply.github.com"
-          git add CHANGELOG.md .claude-plugin/marketplace.json SKILL.md
-          git commit -m "chore(release): v${VERSION} [skip ci]"
-
-          # Create tag
-          git tag "v${VERSION}"
-
-          # Push commit and tags together
-          git push --follow-tags
+          git add .claude-plugin/marketplace.json SKILL.md
+          git commit --amend --no-edit
+          git push --force-with-lease
 
       # 3. Create GitHub Release
       # Only run if a new version was created