fix: 为所有 skill 的 .workflow/ 路径添加 projectRoot 前缀

从子目录执行 skill 时，相对路径 .workflow/ 会导致产物落到错误位置。
通过 git rev-parse --show-toplevel || pwd 检测项目根目录，
所有 .workflow/ 路径引用统一加上 {projectRoot} 前缀确保路径正确。

涉及 72 个文件，覆盖 20+ 个 skill。

.codex/skills/workflow-test-fix-cycle/SKILL.md

@@ -88,8 +88,8 @@ const agentId = spawn_agent({
 
 ### MANDATORY FIRST STEPS (Agent Execute)
 1. **Read role definition**: ~/.codex/agents/{agent-type}.md (MUST read first)
-2. Read: .workflow/project-tech.json
-3. Read: .workflow/project-guidelines.json
+2. Read: ${projectRoot}/.workflow/project-tech.json
+3. Read: ${projectRoot}/.workflow/project-guidelines.json
 
 ## TASK CONTEXT
 ${taskContext}
@@ -263,7 +263,7 @@ Phase 2: Test-Cycle Execution (phases/02-test-cycle-execute.md)
 ### Directory Structure
 
 ```
-.workflow/active/WFS-test-[session]/
+{projectRoot}/.workflow/active/WFS-test-[session]/
 ├── workflow-session.json              # Session metadata
 ├── IMPL_PLAN.md                       # Test generation and execution strategy
 ├── TODO_LIST.md                       # Task checklist