Add Chinese documentation for custom skills development and reference guide

- Created a new document for custom skills development (`custom.md`) detailing the structure, creation, implementation, and best practices for developing custom CCW skills.
- Added an index document (`index.md`) summarizing all built-in skills, their categories, and usage examples.
- Introduced a reference guide (`reference.md`) providing a quick reference for all 33 built-in CCW skills, including triggers and purposes.

docs/skills/templates/autonomous-action.md

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+# Autonomous Action Template
+
+> 用途: 自主行动模板，用于 Autonomous 类型 Skill 的具体行动
+
+## 模板
+
+```markdown
+# Action: {Action Name}
+
+> **Skill**: {Skill Name}
+> **Action Type**: {Analysis|Execution|Verification}
+> **Estimated Duration**: {X minutes}
+
+## Description
+
+详细描述这个行动的目的和功能
+
+## Trigger Conditions
+
+| Condition | Description | Check Method |
+|-----------|-------------|--------------|
+| condition1 | 描述 | 如何检查 |
+| condition2 | 描述 | 如何检查 |
+
+## Input Parameters
+
+| Parameter | Type | Required | Description | Default |
+|-----------|------|----------|-------------|---------|
+| param1 | string | Yes | 参数描述 | - |
+| param2 | number | No | 参数描述 | 42 |
+| param3 | array | No | 参数描述 | [] |
+
+## Output
+
+| Field | Type | Description |
+|-------|------|-------------|
+| result1 | string | 结果描述 |
+| result2 | object | 结果描述 |
+| success | boolean | 行动是否成功 |
+
+## Execution Logic
+
+### Step 1: {Step Name}
+
+**Description**: 步骤描述
+
+**Implementation**:
+```typescript
+// 示例代码
+const step1Result = await doSomething(input);
+if (!step1Result) {
+  throw new Error('Step 1 failed');
+}
+```
+
+**Validation**: 如何验证步骤成功
+
+### Step 2: {Step Name}
+
+**Description**: 步骤描述
+
+**Implementation**:
+```typescript
+// 示例代码
+const step2Result = await process(step1Result);
+```
+
+**Validation**: 如何验证步骤成功
+
+### Step 3: {Step Name}
+
+...
+
+## Error Handling
+
+| Error | Cause | Handling | Retry |
+|-------|-------|----------|-------|
+| ErrorType1 | 原因描述 | 处理方式 | Yes/No |
+| ErrorType2 | 原因描述 | 处理方式 | Yes/No |
+
+**Error Recovery Logic**:
+```typescript
+try {
+  return await execute();
+} catch (error) {
+  if (error instanceof RecoverableError) {
+    return await recover(error);
+  }
+  throw error;
+}
+```
+
+## Side Effects
+
+| Effect | Description | Mitigation |
+|--------|-------------|------------|
+| Side effect 1 | 描述 | 缓解措施 |
+| Side effect 2 | 描述 | 缓解措施 |
+
+## Dependencies
+
+| Dependency | Type | Version | Description |
+|------------|------|---------|-------------|
+| dep1 | internal | - | 内部依赖描述 |
+| dep2 | external | ^1.0.0 | 外部依赖描述 |
+
+## Testing
+
+### Test Cases
+
+| Case | Input | Expected Output |
+|------|-------|-----------------|
+| Normal case | `{param: "value"}` | `{result: "expected"}` |
+| Edge case | `{param: null}` | `{result: "default"}` |
+| Error case | `{param: "invalid"}` | Throws Error |
+
+### Test Implementation
+
+```typescript
+describe('ActionName', () => {
+  it('should handle normal case', async () => {
+    const result = await actionName({ param: 'value' });
+    expect(result).toEqual({ result: 'expected' });
+  });
+
+  it('should handle edge case', async () => {
+    const result = await actionName({ param: null });
+    expect(result).toEqual({ result: 'default' });
+  });
+
+  it('should throw on invalid input', async () => {
+    await expect(actionName({ param: 'invalid' }))
+      .rejects.toThrow(Error);
+  });
+});
+```
+
+## Metrics
+
+| Metric | Type | Unit |
+|--------|------|------|
+| duration | histogram | milliseconds |
+| success_rate | gauge | percentage |
+| error_count | counter | count |
+
+## Example Usage
+
+```typescript
+// 基本使用
+const result = await actionName({
+  param1: 'value1',
+  param2: 100
+});
+
+console.log(result);
+
+// 带重试
+const result = await actionName.withRetry({
+  param1: 'value1'
+}, { maxRetries: 3 });
+
+// 带回调
+await actionName.withCallback({
+  param1: 'value1'
+}, {
+  onProgress: (progress) => console.log(progress),
+  onComplete: (result) => console.log('Done', result)
+});
+```
+```
+
+## 使用说明
+
+1. **触发**: skill-generator Phase 3 (Autonomous 模式)
+2. **输入**: Phase 2 skill-config.json
+3. **输出**: actions/{action-name}.md
+4. **命名**: 使用动词-名词格式 (如 collect-context.md)
+
+---
+
+## 示例
+
+### 简化示例
+
+```markdown
+# Action: quick-scan
+
+> **Skill**: review-code
+> **Action Type**: Analysis
+> **Estimated Duration**: 5 minutes
+
+## Description
+
+快速扫描目标代码，识别高风险区域，为深度审查提供焦点
+
+## Trigger Conditions
+
+| Condition | Description | Check Method |
+|-----------|-------------|--------------|
+| context_collected | 上下文收集完成 | state.context != null |
+| target_exists | 目标路径有效 | file exists check |
+
+## Input Parameters
+
+| Parameter | Type | Required | Description | Default |
+|-----------|------|----------|-------------|---------|
+| files | array | Yes | 要扫描的文件列表 | - |
+| dimensions | array | No | 要检查的维度 | ["all"] |
+| risk_threshold | number | No | 风险阈值 | 0.5 |
+
+## Output
+
+| Field | Type | Description |
+|-------|------|-------------|
+| risk_areas | array | 高风险区域列表 |
+| scan_summary | object | 扫描摘要 |
+| recommendations | array | 建议的审查重点 |
+
+## Execution Logic
+
+### Step 1: 按文件类型分组
+
+```typescript
+const groups = groupBy(files, f => f.extension);
+// ts/tsx -> TypeScript review rules
+// py -> Python review rules
+```
+
+### Step 2: 应用快速检查规则
+
+```typescript
+const risks = [];
+for (const file of files) {
+  const fileRisks = applyQuickChecks(file);
+  risks.push(...fileRisks);
+}
+```
+
+### Step 3: 聚合和排序
+
+```typescript
+const aggregated = aggregateByLocation(risks);
+const sorted = sortBySeverity(aggregated);
+```
+
+## Error Handling
+
+| Error | Cause | Handling | Retry |
+|-------|-------|----------|-------|
+| FileAccessError | 文件无法读取 | 跳过文件，记录警告 | No |
+| ParseError | 代码解析失败 | 标记为需要人工审查 | No |
+
+## Testing
+
+| Case | Input | Expected Output |
+|------|-------|-----------------|
+| Normal | 10 files | risk_areas non-empty |
+| Empty | 0 files | risk_areas empty |
+| ParseError | Invalid code | Area marked for manual review |
+```