# Prompt: New Feature

Load first: `.ai/constitution.md`, `.ai/architecture.md`, `.ai/coding.md`, `.ai/api.md`, `.ai/review.md`, `.ai/definition-of-done.md`, **`.ai/product/feature-design.md`**.

## Process

0. **Feature Spec（强制）**
   - 确认 `feature-map` 节点与分期。
   - 若无 Spec：复制 `product/feature-spec/_TEMPLATE.md` → `<id>.md`，填满 §1–§13；登记 `feature-spec/README.md`。
   - 核对 §4 Flow / §7 Rules / §9 API / §12 Acceptance 非空；文案过 lexicon。
   - Playbook: `playbooks/feature-spec.md`。
1. Restate the feature in one sentence and list files you will touch.
2. Align OpenAPI / erd with Spec §8/§9；更新 Spec §14。
3. Follow feature flow: API → Service → Repository → Migration → SDK/types → UI → Test → Docs.
4. Implement the smallest vertical slice that satisfies Spec §12.
5. Run builds/tests for touched sides.
6. Output `.ai/review.md` Review block；勾选 `checklists/feature.md`.
7. Confirm Definition of Done（含 Feature Spec 项）。

## Forbidden

- Coding from a one-line ask without Feature Spec.
- Inventing APIs not in Spec / OpenAPI.
- Editing legacy root HTML unless migration is the task.
- Shipping UI-only unlock/payment without server checks.