ci: replace custom manifest validation with claude plugin validate

.github/workflows/ci.yaml

@@ -76,10 +76,12 @@ jobs:
           echo "Valid: ${{ steps.validate.outputs.valid }}"
           echo "Errors: ${{ steps.validate.outputs.errors }}"
           echo "Warnings: ${{ steps.validate.outputs.warnings }}"
-  manifest-validation:
-    name: 📦 Manifest Validation
+  plugin-validate:
+    name: 📦 Plugin Validation
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v6
-      - name: Validate Plugin Manifest
-        run: bash ./scripts/validate_plugin_manifest.sh
+      - name: Install Claude Code
+        run: npm install -g @anthropic-ai/claude-code
+      - name: Validate Plugin
+        run: claude plugin validate .

CONTRIBUTING.md

@@ -78,7 +78,7 @@ Every pull request runs the following checks automatically:
 | Spelling | Runs cspell on all `*.md` files | `config/cspell.json` |
 | File size | Ensures no file exceeds 50 KB | `scripts/check_large_files.sh` |
 | Skill validation | Validates `SKILL.md` frontmatter and structure | `scripts/validate_skills.sh` |
-| Manifest validation | Validates `.claude-plugin/plugin.json` | `scripts/validate_plugin_manifest.sh` |
+| Plugin validation | Validates and test-installs the plugin | `claude plugin validate .` |
 
 If the spelling check flags a legitimate word, add it to `config/cspell.json` in the `words` array.