fix: grant commit permissions to claude.yml workflow (#109)

- Add contents: write permission to enable git commit and push operations
- Add pull-requests: write permission to enable PR updates and comments
- Allows Claude to commit changes directly when addressing code review feedback
- Maintains security by keeping permissions scoped to necessary operations

Author: lgallard

.github/workflows/claude.yml

@@ -19,8 +19,8 @@ jobs:
       (github.event_name == 'issues' && (contains(github.event.issue.body, '@claude') || contains(github.event.issue.title, '@claude')))
     runs-on: ubuntu-latest
     permissions:
-      contents: read
-      pull-requests: read
+      contents: write # Enable git commit and push operations
+      pull-requests: write # Enable PR updates and comments
       issues: read
       id-token: write
       actions: read # Required for Claude to read CI results on PRs