Add manual issue triage workflow

- Add optional issue_number parameter to Claude Issue Triage Action
- Create manual workflow that accepts comma-separated issue numbers
- Maintains backward compatibility with existing issue event workflow

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

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

.github/actions/claude-issue-triage-action/action.yml

@@ -12,6 +12,9 @@ inputs:
   github_token:
     description: "GitHub token with repo and issues permissions"
     required: true
+  issue_number:
+    description: "Issue number to triage (optional - defaults to event issue number)"
+    required: false
 
 runs:
   using: "composite"
@@ -32,7 +35,7 @@ runs:
 
         Issue Information:
         - REPO: ${{ github.repository }}
-        - ISSUE_NUMBER: ${{ github.event.issue.number }}
+        - ISSUE_NUMBER: ${{ inputs.issue_number || github.event.issue.number }}
 
         TASK OVERVIEW: