fix(git): 補齊稽核缺失並修掉護欄失效

What：依 jsc-meta:skill-check 的稽核結果修正技能與工具——補上每個步驟的可檢核完成條件、
把留在內文的標準輸入輸出流程下放 tools/、修正查表與退碼路由造成的誤判。

Why：稽核發現這些缺失會讓技能在實際執行時走錯分支或靜默通過。
完成條件缺漏是最常被違反的一項；退碼誤判與查表錯誤則會讓良性狀況被當成失敗。

How：逐項對照 references/guidelines.md 的審核檢查清單修正，新增的工具都有
documented exit codes，並以真實執行驗證每條路徑。

Who：jsc-meta:skill-check 例行稽核（2026-08-25）。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

skills/commit/SKILL.md

@@ -7,9 +7,9 @@ description: Group all pending file changes by conventional type and feature, th
 
 ## Steps
 
-1. Track every file change: inspect all changes with `git status --porcelain` first, then `git add` group by group. Never `git add -A` and commit everything at once.
-2. Group the changes by same type plus same requirement or feature. One group is one commit.
-3. Commit each group with the format `{type}({requirement or feature}): {message}`.
+1. Track every file change: inspect all changes with `git status --porcelain` first, then `git add` group by group. `git add -A` followed by one bulk commit is forbidden. Done when every path listed by `git status --porcelain` is assigned to exactly one group, before the first commit runs.
+2. Group the changes by same type plus same requirement or feature. One group is one commit. Done when each group carries one type and one requirement or feature, and no path sits in two groups.
+3. Commit each group with the format `{type}({requirement or feature}): {message}`. Done when `git status --porcelain` returns empty; report done only then.
 
 ## Type table