---
description: Create a unified implementation plan.
---

## User Input
$ARGUMENTS

## Instructions

1.  **Read**: Load the `spec.md` provided by the user.
2.  **Draft Plan**:
    * Create/Update **ONE file**: `specs/[feature_name]/plan.md`.
    * **Section 1: Architecture**: Briefly list changed files and data models.
    * **Section 2: Step-by-Step**: List the implementation steps (Todo list) directly in this file.
3.  **Format**:
    * Use checkboxes `- [ ]` for the steps so they are clickable.
    * Mark steps as `[Frontend]` or `[Backend]`.
4.  **Constraint**: Do NOT create `tasks.md`. Keep it all in `plan.md`.