Add execution and planning agent prompts, specifications, and quality standards

- Created execution agent prompt for issue execution with detailed deliverables and validation criteria.
- Developed planning agent prompt to analyze issues and generate structured solution plans.
- Introduced issue handling specifications outlining the workflow and issue structure.
- Established quality standards for evaluating completeness, consistency, correctness, and clarity of solutions.
- Defined solution schema specification detailing the required structure and validation rules for solutions.
- Documented subagent roles and responsibilities, emphasizing the dual-agent strategy for improved workflow efficiency.

.codex/skills/codex-issue-plan-execute/specs/issue-handling.md

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+# Issue Handling Specification
+
+Issue 处理的核心规范和约定。
+
+## When to Use
+
+| Phase | Usage | Section |
+|-------|-------|---------|
+| Phase: action-list | Issue 列表展示 | Issue Status & Display |
+| Phase: action-plan | Issue 规划 | Solution Planning |
+| Phase: action-execute | Issue 执行 | Solution Execution |
+
+---
+
+## Issue Structure
+
+### 基本字段
+
+```json
+{
+  "id": "ISS-20250129-001",
+  "title": "Fix authentication token expiration bug",
+  "description": "Tokens expire too quickly in production",
+  "status": "registered",
+  "priority": "high",
+  "tags": ["auth", "bugfix"],
+  "created_at": "2025-01-29T10:00:00Z",
+  "updated_at": "2025-01-29T10:00:00Z"
+}
+```
+
+### 工作流状态
+
+| Status | Phase | 说明 |
+|--------|-------|------|
+| `registered` | Initial | Issue 已创建，待规划 |
+| `planning` | List → Plan | 正在规划中 |
+| `planned` | Plan → Execute | 规划完成，解决方案已绑定 |
+| `executing` | Execute | 正在执行 |
+| `completed` | Execute → Complete | 执行完成 |
+| `failed` | Any | 执行失败 |
+
+### 工作流字段
+
+```json
+{
+  "id": "ISS-xxx",
+  "status": "registered|planning|planned|executing|completed|failed",
+  "solution_id": "SOL-xxx-1",
+  "planned_at": "2025-01-29T11:00:00Z",
+  "executed_at": "2025-01-29T12:00:00Z",
+  "error": null
+}
+```
+
+## Issue 列表显示
+
+### 格式规范
+
+```
+Status Matrix:
+Total: 5 | Registered: 2 | Planned: 2 | Completed: 1
+
+Issue Details:
+○ [1] ISS-001: Fix login bug (registered)
+→ [2] ISS-002: Add MFA support (planning)
+✓ [3] ISS-003: Refactor auth (completed)
+✗ [4] ISS-004: Update password policy (failed)
+```
+
+### 显示字段
+
+- ID: 唯一标识
+- Title: 简短描述
+- Status: 当前状态
+- Solution ID: 绑定的解决方案（如有）
+
+## Solution Planning
+
+### 规划输入
+
+- Issue ID 和 Title
+- Issue 描述和上下文
+- 项目技术栈和指南
+
+### 规划输出
+
+- Solution ID：`SOL-{issue-id}-{sequence}`
+- Tasks 数组：可执行的任务列表
+- Acceptance Criteria：验收标准
+- 估计时间
+
+### Planning Subagent 职责
+
+1. 分析 issue 描述
+2. 探索相关代码路径
+3. 设计解决方案
+4. 分解为可执行任务
+5. 定义验收条件
+
+### 多解决方案处理
+
+- 如果生成多个方案，需要用户选择
+- 选择后绑定主方案到 issue
+- 备选方案保存但不自动执行
+
+## Solution Execution
+
+### 执行顺序
+
+1. 加载已规划的解决方案
+2. 逐个执行每个 solution 中的所有 tasks
+3. 每个 task：implement → test → verify
+4. 完成后提交一次
+
+### Execution Subagent 职责
+
+1. 加载 solution JSON
+2. 实现所有任务
+3. 运行测试
+4. 验收条件检查
+5. 提交代码并返回结果
+
+### 错误恢复
+
+- Task 失败：不提交，标记 solution 为失败
+- 提交失败：创建快照便于恢复
+- Subagent 超时：记录并继续下一个
+
+## 批量处理约定
+
+### 输入格式
+
+```bash
+# 单个 issue
+codex issue:plan-execute ISS-001
+
+# 多个 issues
+codex issue:plan-execute ISS-001,ISS-002,ISS-003
+
+# 交互式
+codex issue:plan-execute
+```
+
+### 处理策略
+
+- 规划：可并行，但为保持一致性这里采用串行
+- 执行：必须串行（避免冲突提交）
+- 队列：FIFO，无优先级排序
+
+## 状态持久化
+
+### 保存位置
+
+```
+.workflow/.scratchpad/codex-issue-{timestamp}/
+├── state.json           # 当前状态快照
+├── state-history.json   # 状态变更历史
+├── queue.json          # 执行队列
+├── solutions/          # 解决方案文件
+├── snapshots/          # 流程快照
+└── final-report.md     # 最终报告
+```
+
+### 快照用途
+
+- 流程恢复：允许从中断点恢复
+- 调试：记录每个阶段的状态变化
+- 审计：跟踪完整的执行过程
+
+## 质量保证
+
+### 验收清单
+
+- [ ] Issue 规范明确
+- [ ] Solution 遵循 schema
+- [ ] All tasks 有 acceptance criteria
+- [ ] 执行成功率 >= 80%
+- [ ] 报告生成完整
+
+### 错误分类
+
+| 级别 | 类型 | 处理 |
+|------|------|------|
+| Critical | 规划失败、提交失败 | 中止该 issue |
+| Warning | 测试失败、条件未满足 | 记录但继续 |
+| Info | 超时、网络延迟 | 日志记录 |