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/prompts/execution-agent.md

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+# Execution Agent Prompt
+
+执行 agent 的提示词模板。
+
+## MANDATORY FIRST STEPS (Agent Execute)
+
+1. **Read role definition**: ~/.codex/agents/issue-execute-agent.md (MUST read first)
+2. Read: .workflow/project-tech.json
+3. Read: .workflow/project-guidelines.json
+4. Read schema: ~/.claude/workflows/cli-templates/schemas/execution-result-schema.json
+
+---
+
+## Goal
+
+Execute solution for issue "{ISSUE_ID}: {ISSUE_TITLE}"
+
+## Scope
+
+- **CAN DO**:
+  - Read and understand planned solution
+  - Implement code changes
+  - Execute tests and validation
+  - Create commits
+  - Handle errors and rollback
+
+- **CANNOT DO**:
+  - Modify solution design
+  - Skip acceptance criteria
+  - Bypass test requirements
+  - Deploy to production
+
+- **Directory**: {PROJECT_ROOT}
+
+## Task Description
+
+Planned Solution: {SOLUTION_JSON}
+
+## Deliverables
+
+### Primary Output: Execution Result JSON
+
+```json
+{
+  "id": "EXR-{ISSUE_ID}-1",
+  "issue_id": "{ISSUE_ID}",
+  "solution_id": "SOL-{ISSUE_ID}-1",
+  "status": "completed|failed",
+  "executed_tasks": [
+    {
+      "task_id": "T1",
+      "title": "Task title",
+      "status": "completed|failed",
+      "files_modified": ["src/auth.ts", "src/auth.test.ts"],
+      "commits": [
+        {
+          "hash": "abc123def",
+          "message": "Implement authentication"
+        }
+      ],
+      "test_results": {
+        "passed": 15,
+        "failed": 0,
+        "command": "npm test -- auth.test.ts"
+      },
+      "acceptance_met": true,
+      "execution_time_minutes": 25,
+      "errors": []
+    }
+  ],
+  "overall_stats": {
+    "total_tasks": 3,
+    "completed": 3,
+    "failed": 0,
+    "total_files_modified": 5,
+    "total_commits": 3,
+    "total_time_minutes": 75
+  },
+  "final_commit": {
+    "hash": "xyz789abc",
+    "message": "Resolve issue ISS-001: Feature implementation"
+  },
+  "verification": {
+    "all_tests_passed": true,
+    "all_acceptance_met": true,
+    "no_regressions": true
+  }
+}
+```
+
+### Validation
+
+Ensure:
+- [ ] All planned tasks executed
+- [ ] All acceptance criteria verified
+- [ ] Tests pass without failures
+- [ ] All commits created with descriptive messages
+- [ ] Execution result follows schema exactly
+- [ ] No breaking changes introduced
+
+### Return JSON
+
+```json
+{
+  "status": "completed|failed",
+  "execution_result_id": "EXR-{ISSUE_ID}-1",
+  "issue_id": "{ISSUE_ID}",
+  "tasks_completed": 3,
+  "files_modified": 5,
+  "commits": 3,
+  "verification": {
+    "all_tests_passed": true,
+    "all_acceptance_met": true,
+    "no_regressions": true
+  },
+  "final_commit_hash": "xyz789abc",
+  "errors": []
+}
+```
+
+## Quality Standards
+
+- **Completeness**: All tasks executed, all acceptance criteria met
+- **Correctness**: Tests pass, no regressions, code quality maintained
+- **Traceability**: Each change tracked with commits and test results
+- **Safety**: Changes verified before final commit
+
+## Success Criteria
+
+✓ All planned tasks completed
+✓ All acceptance criteria verified and met
+✓ Unit tests pass with 100% success rate
+✓ No regressions in existing functionality
+✓ Final commit created with descriptive message
+✓ Execution result JSON is valid and complete