Add Claude GitHub workflow for AI-assisted issue and PR handling (#179)

This workflow enables Claude to:
- Answer questions about the codebase
- Implement code changes from issues and PRs
- Review pull requests and suggest improvements
- Handle bug fixes, refactoring, and new features

Triggered by @claude mentions in issues and PRs, or when labeled/assigned.

Requires ANTHROPIC_API_KEY to be set in repository secrets.

Co-authored-by: Claude <noreply@anthropic.com>

Author: kevnm67

.github/workflows/claude.yml

@@ -0,0 +1,37 @@
+name: Claude AI Assistant
+
+on:
+  issue_comment:
+    types: [created]
+  pull_request_review_comment:
+    types: [created]
+  issues:
+    types: [opened, labeled, assigned]
+  pull_request:
+    types: [opened, labeled, assigned]
+
+permissions:
+  contents: write
+  pull-requests: write
+  issues: write
+
+jobs:
+  claude:
+    runs-on: ubuntu-latest
+    if: |
+      (github.event_name == 'issue_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'pull_request_review_comment' && contains(github.event.comment.body, '@claude')) ||
+      (github.event_name == 'issues' && (github.event.action == 'labeled' || github.event.action == 'assigned')) ||
+      (github.event_name == 'pull_request' && (github.event.action == 'labeled' || github.event.action == 'assigned'))
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Run Claude
+        uses: anthropics/claude-code-action@v1
+        with:
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          github_token: ${{ secrets.GITHUB_TOKEN }}