chore: migrate pre-push hook to pre-commit framework

Add pre-push stage hooks:
- run-tests: execute all test-*.sh files and bats suite
- check-manifests: validate marketplace.json and plugin.json paths

Remove hardcoded .git/hooks/pre-push.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

.pre-commit-config.yaml

@@ -34,6 +34,24 @@ repos:
 
   - repo: local
     hooks:
+      - id: run-tests
+        name: Run test suite
+        description: Run all test-*.sh files and bats suite
+        entry: bash tests/run-tests.sh
+        language: system
+        stages: [pre-push]
+        pass_filenames: false
+        always_run: true
+
+      - id: check-manifests
+        name: Check plugin manifests
+        description: Validate marketplace.json and plugin.json paths
+        entry: bash scripts/check-manifests.sh
+        language: system
+        stages: [pre-push]
+        pass_filenames: false
+        always_run: true
+
       - id: skill-frontmatter
         stages: ['pre-commit']
         name: SKILL.md frontmatter validation