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/phases/state-schema.md

@@ -0,0 +1,136 @@
+# State Schema Definition
+
+状态结构定义和验证规则。
+
+## 初始状态
+
+```json
+{
+  "status": "pending",
+  "phase": "init",
+  "work_dir": "",
+  "issues": {},
+  "queue": [],
+  "completed_actions": [],
+  "context": {
+    "total_issues": 0,
+    "completed_count": 0,
+    "failed_count": 0
+  },
+  "errors": [],
+  "created_at": "ISO-8601",
+  "updated_at": "ISO-8601"
+}
+```
+
+## 状态转移
+
+```
+pending
+  ↓
+init (Action-Init)
+  ↓
+running
+  ├→ list (Action-List) → Display issues
+  ├→ plan (Action-Plan) → Plan issues
+  ├→ execute (Action-Execute) → Execute solutions
+  ├→ back to list/plan/execute loop
+  │
+  └→ complete (Action-Complete) → Finalize
+       ↓
+completed
+```
+
+## 字段说明
+
+| 字段 | 类型 | 说明 |
+|------|------|------|
+| `status` | string | "pending"\|"running"\|"completed" - 全局状态 |
+| `phase` | string | "init"\|"listing"\|"planning"\|"executing"\|"complete" - 当前阶段 |
+| `work_dir` | string | 工作目录路径 |
+| `issues` | object | Issue 状态映射 `{issue_id: IssueState}` |
+| `queue` | array | 待执行队列 |
+| `completed_actions` | array | 已执行动作 ID 列表 |
+| `context` | object | 执行上下文信息 |
+| `errors` | array | 错误日志 |
+
+## Issue 状态
+
+```json
+{
+  "id": "ISS-xxx",
+  "title": "Issue title",
+  "status": "registered|planning|planned|executing|completed|failed",
+  "solution_id": "SOL-xxx-1",
+  "planned_at": "ISO-8601",
+  "executed_at": "ISO-8601",
+  "error": null
+}
+```
+
+## Queue Item
+
+```json
+{
+  "item_id": "S-1",
+  "issue_id": "ISS-xxx",
+  "solution_id": "SOL-xxx-1",
+  "status": "pending|executing|completed|failed"
+}
+```
+
+## 验证函数
+
+```javascript
+function validateState(state) {
+  // Required fields
+  if (!state.status) throw new Error("Missing: status");
+  if (!state.phase) throw new Error("Missing: phase");
+  if (!state.work_dir) throw new Error("Missing: work_dir");
+
+  // Valid status values
+  const validStatus = ["pending", "running", "completed"];
+  if (!validStatus.includes(state.status)) {
+    throw new Error(`Invalid status: ${state.status}`);
+  }
+
+  // Issues structure
+  if (typeof state.issues !== "object") {
+    throw new Error("issues must be object");
+  }
+
+  // Queue is array
+  if (!Array.isArray(state.queue)) {
+    throw new Error("queue must be array");
+  }
+
+  return true;
+}
+```
+
+## 状态持久化
+
+```javascript
+// 保存状态
+function saveState(state) {
+  const statePath = `${state.work_dir}/state.json`;
+  Write(statePath, JSON.stringify(state, null, 2));
+
+  // 保存历史
+  const historyPath = `${state.work_dir}/state-history.json`;
+  const history = Read(historyPath).then(JSON.parse).catch(() => []);
+  history.push({
+    timestamp: new Date().toISOString(),
+    phase: state.phase,
+    completed_actions: state.completed_actions.length,
+    issues_count: Object.keys(state.issues).length
+  });
+  Write(historyPath, JSON.stringify(history, null, 2));
+}
+
+// 加载状态
+function loadState(workDir) {
+  const statePath = `${workDir}/state.json`;
+  return JSON.parse(Read(statePath));
+}
+```