Update Claude workflow configuration (#234)

## Summary
- Enable additional permissions for Claude to read CI results
- Configure Claude to trigger when assigned to issues
- Allow bash command execution for this public repository
- Add custom instructions for concise GitHub comment formatting

.github/workflows/claude.yml

@@ -23,7 +23,7 @@ jobs:
       pull-requests: read
       issues: read
       id-token: write
-      actions: read # Required for Claude to read CI results on PRs
+      actions: read
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -36,28 +36,16 @@ jobs:
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
 
-          # This is an optional setting that allows Claude to read CI results on PRs
+          # Allow Claude to read CI results on PRs
           additional_permissions: |
             actions: read
+
+          # Trigger when assigned to an issue
+          assignee_trigger: "claude"
           
-          # Optional: Specify model (defaults to Claude Sonnet 4, uncomment for Claude Opus 4.1)
-          # model: "claude-opus-4-1-20250805"
+          # Allow Claude to run bash
+          # This should be safe given the repo is already public
+          allowed_tools: "Bash"
           
-          # Optional: Customize the trigger phrase (default: @claude)
-          # trigger_phrase: "/claude"
-          
-          # Optional: Trigger when specific user is assigned to an issue
-          # assignee_trigger: "claude-bot"
-          
-          # Optional: Allow Claude to run specific commands
-          # allowed_tools: "Bash(npm install),Bash(npm run build),Bash(npm run test:*),Bash(npm run lint:*)"
-          
-          # Optional: Add custom instructions for Claude to customize its behavior for your project
-          # custom_instructions: |
-          #   Follow our coding standards
-          #   Ensure all new code has tests
-          #   Use TypeScript for new files
-          
-          # Optional: Custom environment variables for Claude
-          # claude_env: |
-          #   NODE_ENV: test
+          custom_instructions: |
+            If posting a comment to GitHub, give a concise summary of the comment at the top and put all the details in a <details> block.