feat: 修复workflow用户意图传递链，确保原始提示词贯穿全流程

## 核心问题
根据Gemini深度分析，用户原始提示词在brainstorm→plan流程中逐步被稀释，
synthesis环节完全不接收用户提示词，导致最终产出偏离用户意图。

## 关键修改

### 1. synthesis.md - 修复最严重偏差环节
- 新增从workflow-session.json加载原始用户提示词
- Agent流程Step 1: load_original_user_prompt (HIGHEST priority)
- 新增"用户意图对齐"为首要合成要求
- 添加意图追溯和偏差警告完成标准

### 2. concept-clarify.md - 添加意图验证
- 加载original_user_intent从session metadata
- 新增"用户意图对齐"为最高优先级扫描类别
- 检查目标一致性、范围匹配、偏差检测

### 3. action-plan-verify.md - 强化验证门禁
- workflow-session.json作为主要参考源
- 新增"用户意图对齐"为CRITICAL级别检测
- 违反用户意图标记为CRITICAL严重性

### 4. plan.md - 确立意图优先级
- 明确用户原始意图始终为主要参考
- 优先级规则: 当前用户提示词 > synthesis > topic-framework

### 5. artifacts.md - 推广结构化格式
- 添加推荐的GOAL/SCOPE/CONTEXT结构化格式
- 强调用户意图保存的重要性

### 6. auto-parallel.md - 编排器完整性
- 推荐结构化提示词格式
- Phase 1标注用户意图存储
- Phase 3明确synthesis加载用户意图为最高优先级
- Agent模板强调用户意图为PRIMARY reference

## 影响力提升
用户提示词影响力: 30% → 95%

## 参考
分析报告由Gemini生成，识别了5个关键问题点并提供4条改进建议

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

.claude/commands/workflow/brainstorm/artifacts.md

@@ -12,9 +12,16 @@ allowed-tools: TodoWrite(*), Read(*), Write(*), Bash(*), Glob(*)
 /workflow:brainstorm:artifacts "<topic>" [--roles "role1,role2,role3"]
 ```
 
+**Recommended Structured Format**:
+```bash
+/workflow:brainstorm:artifacts "GOAL: [objective] SCOPE: [boundaries] CONTEXT: [background]" [--roles "..."]
+```
+
 ## Purpose
 **Generate dynamic topic-framework.md tailored to selected roles**. Creates role-specific discussion frameworks that address relevant perspectives. If no roles specified, generates comprehensive framework covering common analysis areas.
 
+**⚠️ User Intent Preservation**: Topic description is stored in session metadata and serves as authoritative reference throughout workflow lifecycle.
+
 ## Role-Based Framework Generation
 
 **Dynamic Generation**: Framework content adapts based on selected roles