feat: Add multi-perspective issue discovery and structured issue creation

- Implemented issue discovery prompt to analyze code from various perspectives (bug, UX, test, quality, security, performance, maintainability, best-practices).
- Created structured issue generation prompt from GitHub URLs or text descriptions, including clarity detection and optional clarification questions.
- Introduced CCW Loop-B hybrid orchestrator pattern for iterative development, featuring a coordinator and specialized workers with batch wait support.
- Defined state management, session structure, and output schemas for the CCW Loop-B workflow.
- Added error handling and best practices documentation for the new features.

.codex/skills/ccw-loop-b/README.md

@@ -0,0 +1,102 @@
+# CCW Loop-B (Hybrid Orchestrator Pattern)
+
+协调器 + 专用 worker 的迭代开发工作流。
+
+## Overview
+
+CCW Loop-B 采用混合模式设计：
+- **Coordinator**: 状态管理、worker 调度、结果汇聚
+- **Workers**: 专注各自领域（develop/debug/validate）
+
+## Installation
+
+```
+.codex/skills/ccw-loop-b/
++-- SKILL.md                    # Main skill definition
++-- README.md                   # This file
++-- phases/
+|   +-- orchestrator.md         # Coordinator logic
+|   +-- state-schema.md         # State structure
++-- specs/
+    +-- action-catalog.md       # Action catalog
+
+.codex/agents/
++-- ccw-loop-b-init.md          # Init worker
++-- ccw-loop-b-develop.md       # Develop worker
++-- ccw-loop-b-debug.md         # Debug worker
++-- ccw-loop-b-validate.md      # Validate worker
++-- ccw-loop-b-complete.md      # Complete worker
+```
+
+## Execution Modes
+
+| Mode | Description | Use Case |
+|------|-------------|----------|
+| `interactive` | 用户选择 action | 复杂任务，需要人工决策 |
+| `auto` | 自动顺序执行 | 标准开发流程 |
+| `parallel` | 并行多维度分析 | 需要快速全面评估 |
+
+## Usage
+
+```bash
+# Interactive (default)
+/ccw-loop-b TASK="Implement feature X"
+
+# Auto mode
+/ccw-loop-b --mode=auto TASK="Fix bug Y"
+
+# Parallel analysis
+/ccw-loop-b --mode=parallel TASK="Analyze module Z"
+
+# Resume
+/ccw-loop-b --loop-id=loop-b-xxx
+```
+
+## Session Files
+
+```
+.loop/
++-- {loopId}.json              # Master state
++-- {loopId}.workers/          # Worker outputs (JSON)
++-- {loopId}.progress/         # Human-readable progress (MD)
+```
+
+## Core Pattern
+
+### Coordinator + Worker
+
+```javascript
+// Coordinator spawns specialized worker
+const worker = spawn_agent({ message: buildWorkerPrompt(action) })
+
+// Wait for completion
+const result = wait({ ids: [worker], timeout_ms: 600000 })
+
+// Process result
+const output = result.status[worker].completed
+updateState(output)
+
+// Cleanup
+close_agent({ id: worker })
+```
+
+### Batch Wait (Parallel Mode)
+
+```javascript
+// Spawn multiple workers
+const workers = [
+  spawn_agent({ message: developPrompt }),
+  spawn_agent({ message: debugPrompt }),
+  spawn_agent({ message: validatePrompt })
+]
+
+// Batch wait
+const results = wait({ ids: workers, timeout_ms: 900000 })
+
+// Merge results
+const merged = mergeOutputs(results)
+```
+
+## License
+
+MIT