docs(P12.2-P12.3): add state machine overview, permissions overview, and propose flow documentation

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# HarborForge — Propose → Feature Story → Milestone 流程
> 更新时间2026-03-18
> 本文档描述 feature 进入 milestone 的完整流程。
---
## 1. 流程总览
```
用户创建 Propose 负责人审阅 系统自动生成
│ │ │
▼ ▼ ▼
Propose (open) ──accept──▶ Propose (accepted)
│ │
│ ▼
│ Feature Story Task (pending)
│ 归属选定 milestone
──reject──▶ Propose (rejected)
──reopen──▶ Propose (open) ── 重新审阅 ──▶ ...
```
---
## 2. 详细步骤
### Step 1创建 Propose
- 用户在 project 下创建 propose
- 填写 title + description
- 系统自动生成 `propose_code`(格式:`{proj_code}:P{i:05x}`
- 初始状态:`open`
### Step 2审阅
- 负责人在 Propose 详情页查看内容
- `open` 状态下可选操作:
- **Accept** — 接受并生成 feature task
- **Reject** — 拒绝(建议填写 reason
- Propose 创建者在 `open` 状态下可编辑 title/description
### Step 3aAccept
前置条件:
- 操作者拥有 `propose.accept` 权限
- 选择一个 `open` 状态的目标 milestone同 project
系统执行:
1. Propose status → `accepted`
2. 在目标 milestone 下自动创建 `story/feature` task
- 继承 title、description、created_by
- 默认状态 `pending`
3. 自动回填 `feat_task_id`(只读字段)
4. 写入 activity log
Accept 后:
- Propose 详情页显示 "View Generated Task" 跳转按钮
- Propose 主体不可再编辑
### Step 3bReject
前置条件:
- 操作者拥有 `propose.reject` 权限
系统执行:
1. Propose status → `rejected`
2. 写入 reject reasonactivity log
Reject 后:
- Propose 详情页显示 "Reopen" 按钮
- Propose 主体不可编辑
### Step 4Reopen可选
前置条件:
- 操作者拥有 `propose.reopen` 权限
- Propose 当前状态为 `rejected`
系统执行:
1. Propose status → `open`(复用原 propose不创建新记录
2. 写入 reopen 记录
Reopen 后:
- 可再次编辑 title/description
- 可再次 accept 或 reject
---
## 3. Feature Task 生命周期
Accept 生成的 feature story task 遵循标准 task 状态机:
```
pending → open → undergoing → completed
(触发 milestone auto-complete
仅当该 task 是 release task 时)
```
关键约束:
- Feature story task **不能**通过通用 create task 页面创建
- Milestone 进入 `freeze` 后,不再接受新的 feature story
- Milestone 非 `open` 时,已有 feature story task 的 body 字段锁定
---
## 4. Milestone 完整生命周期(含 propose
```
1. 创建 milestone (open)
2. 通过 propose → accept 添加 feature story tasks
3. 创建 release maintenance task通过 milestone endpoint
4. Freeze milestone需有且仅有 1 个 release task
5. 满足依赖后 Start milestone → undergoing
6. Tasks 开始执行pending → open → undergoing → completed
7. Release maintenance task 完成 → milestone 自动 completed
```
---
## 5. Propose 编码规则
- 格式:`{proj_code}:P{i:05x}`
- 示例:`HF:P00001`, `HF:P00002`, `HF:P0000a`
- 每个 project 独立递增
- 并发安全:数据库 unique 约束保底
---
## 6. API 端点
| 操作 | 方法 | 路径 |
|---------|--------|--------------------------------------------------|
| 创建 | POST | `/projects/{pid}/proposes` |
| 列表 | GET | `/projects/{pid}/proposes` |
| 详情 | GET | `/projects/{pid}/proposes/{id}` |
| 编辑 | PATCH | `/projects/{pid}/proposes/{id}` |
| Accept | POST | `/projects/{pid}/proposes/{id}/actions/accept` |
| Reject | POST | `/projects/{pid}/proposes/{id}/actions/reject` |
| Reopen | POST | `/projects/{pid}/proposes/{id}/actions/reopen` |
---
## 7. CLI 命令
```bash
# 列出 proposes
harborforge proposes --project <project_id>
# 创建 propose
harborforge propose-create "My Feature Idea" --project <project_id>
# Accept需指定 milestone
harborforge propose-accept <propose_id> --project <project_id> --milestone <milestone_id>
# Reject可选 reason
harborforge propose-reject <propose_id> --project <project_id> --reason "Not in scope"
# Reopen
harborforge propose-reopen <propose_id> --project <project_id>
```