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/parallel-dev-cycle/roles/code-developer.md

@@ -159,7 +159,7 @@ When tests fail during implementation, the CD agent MUST initiate the hypothesis
 
 ### Debug Log Format (NDJSON)
 
-File: `.workflow/.cycle/{cycleId}.progress/cd/debug-log.ndjson`
+File: `{projectRoot}/.workflow/.cycle/{cycleId}.progress/cd/debug-log.ndjson`
 
 Schema:
 ```json
@@ -191,7 +191,7 @@ Debug workflow generates an additional file:
 
 ### Phase 3: Output
 
-Generate files in `.workflow/.cycle/{cycleId}.progress/cd/`:
+Generate files in `{projectRoot}/.workflow/.cycle/{cycleId}.progress/cd/`:
 
 **implementation.md**:
 ```markdown

.codex/skills/parallel-dev-cycle/roles/exploration-planner.md

@@ -105,7 +105,7 @@ The Exploration & Planning Agent is responsible for understanding the codebase a
 
 ### Phase 3: Output
 
-Generate files in `.workflow/.cycle/{cycleId}.progress/ep/`:
+Generate files in `{projectRoot}/.workflow/.cycle/{cycleId}.progress/ep/`:
 
 **exploration.md**:
 ```markdown

.codex/skills/parallel-dev-cycle/roles/requirements-analyst.md

@@ -55,7 +55,7 @@ The Requirements Analyst maintains **a single file** (`requirements.md`) contain
 ### Phase 1: Initial Analysis (v1.0.0)
 
 1. **Read Context**
-   - Cycle state from `.workflow/.cycle/{cycleId}.json`
+   - Cycle state from `{projectRoot}/.workflow/.cycle/{cycleId}.json`
    - Task description from state
    - Project tech stack and guidelines
 
@@ -109,7 +109,7 @@ The Requirements Analyst maintains **a single file** (`requirements.md`) contain
 
 ### Phase 3: Output
 
-Generate/update two files in `.workflow/.cycle/{cycleId}.progress/ra/`:
+Generate/update two files in `{projectRoot}/.workflow/.cycle/{cycleId}.progress/ra/`:
 
 **requirements.md** (COMPLETE REWRITE):
 ```markdown

.codex/skills/parallel-dev-cycle/roles/validation-archivist.md

@@ -116,7 +116,7 @@ The Validation & Archival Agent is responsible for verifying implementation qual
 
 ### Phase 4: Output
 
-Generate files in `.workflow/.cycle/{cycleId}.progress/vas/`:
+Generate files in `{projectRoot}/.workflow/.cycle/{cycleId}.progress/vas/`:
 
 **validation.md**:
 ```markdown