fix: sync all version files to 0.30.2 and add CI check

The 0.30.2 bump was done manually and missed several files:
- .claude-plugin/plugin.json (was 0.30.0)
- .claude-plugin/marketplace.json (was 0.30.0)
- npm-package/package.json (was 0.30.1)
- integrations/beads-mcp/pyproject.toml (was 0.30.1)
- integrations/beads-mcp/src/beads_mcp/__init__.py (was 0.30.1)

Added scripts/check-versions.sh and CI job to prevent this in future.
Always use scripts/bump-version.sh for version bumps.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.github/workflows/ci.yml

@@ -7,6 +7,16 @@ on:
     branches: [ main ]
 
 jobs:
+  # Fast check to ensure all version files are in sync
+  check-version-consistency:
+    name: Check version consistency
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - name: Check all versions match
+        run: ./scripts/check-versions.sh
+
   # Fast check to catch accidental .beads/issues.jsonl changes from contributors
   check-no-beads-changes:
     name: Check for .beads changes