feat: add claude code plugin support (#1293)

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

packages/claude-code-plugin/commands/list-tasks-with-subtasks.md

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+List all tasks including their subtasks in a hierarchical view.
+
+This command shows all tasks with their nested subtasks, providing a complete project overview.
+
+## Execution
+
+Run the Task Master list command with subtasks flag:
+```bash
+task-master list --with-subtasks
+```
+
+## Enhanced Display
+
+I'll organize the output to show:
+- Parent tasks with clear indicators
+- Nested subtasks with proper indentation
+- Status badges for quick scanning
+- Dependencies and blockers highlighted
+- Progress indicators for tasks with subtasks
+
+## Smart Filtering
+
+Based on the task hierarchy:
+- Show completion percentage for parent tasks
+- Highlight blocked subtask chains
+- Group by functional areas
+- Indicate critical path items
+
+This gives you a complete tree view of your project structure.