Pin claude-code-action to specific commit SHA

Pins to 35021b1 (v1) which uses Claude Code 2.0.58. This ensures
reproducible builds and prevents unexpected behavior from action updates.

Author: ghostwriternr

.github/workflows/claude-code-review.yml

@@ -144,7 +144,7 @@ jobs:
 
       - name: Run Claude Code Review
         id: claude-review
-        uses: anthropics/claude-code-action@v1
+        uses: anthropics/claude-code-action@35021b13566e99dcbbbe118bcb3fe890354ddc94 # v1 - pins Claude Code 2.0.58
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           plugin_marketplaces: |