feat: add repository_dispatch event support

- Add new progress MCP server for reporting task status via API
- Support repository_dispatch events with task description and progress endpoint
- Introduce isDispatch flag to unify dispatch event handling
- Make GitHub data optional for dispatch events without issues/PRs
- Update prompt generation with dispatch-specific instructions

Enables triggering Claude via repository_dispatch with:
{
  "event_type": "claude_task",
  "client_payload": {
    "description": "Task description",
    "progress_endpoint": "https://api.example.com/progress"
  }
}

base-action/action.yml

@@ -102,7 +102,7 @@ runs:
     - name: Setup Node.js
       uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # https://github.com/actions/setup-node/releases/tag/v4.4.0
       with:
-        node-version: ${{ env.NODE_VERSION || '18.x' }}
+        node-version: ${{ env.NODE_VERSION || '22.x' }}
         cache: ${{ inputs.use_node_cache == 'true' && 'npm' || '' }}
 
     - name: Install Bun
@@ -118,7 +118,9 @@ runs:
 
     - name: Install Claude Code
       shell: bash
-      run: bun install -g @anthropic-ai/claude-code@1.0.67
+      run: |
+        # Install Claude Code
+        bun install -g @anthropic-ai/claude-code
 
     - name: Run Claude Code Action
       shell: bash