chore(skill): 清理全部 23 条历史校验警告

- 11 个超 20KB 的 SKILL.md 拆分，大章节移入 references/details.md
- 7 处非标准字段（arguments/user_invocable）移入 metadata
- 修 req-dev 4 条相对链接；validate 跳过行内代码避免 ![](...) 误报
- validate-skills.py: 23 warns -> 0 warns，0 errors

scripts/validate-skills.py

@@ -127,8 +127,9 @@ def check_skill(rel: Path, skill_md: Path, meta: dict):
         if not docs.is_file():
             warnings.append(f"{where}: promoted 技能缺少四段式文档 docs/skills/{docs.name}")
 
-    # Relative links must resolve.
-    for target in re.findall(r"\]\((\.[^)\s]+|[A-Za-z0-9_-]+/[^)\s]+)\)", body):
+    # Relative links must resolve (inline code spans are examples, skip them).
+    scan_body = re.sub(r"`[^`]*`", "", body)
+    for target in re.findall(r"\]\((\.[^)\s]+|[A-Za-z0-9_-]+/[^)\s]+)\)", scan_body):
         if target.startswith(("http://", "https://", "#")):
             continue
         if not (skill_md.parent / target).exists():