chs: re-add drifted files

dot_agents/skills/git-guardrails-claude-code/SKILL.md

@@ -78,7 +78,7 @@ Add to the appropriate settings file:
 }
 ```
 
-If the settings file already exists, merge the hook into existing `hooks.PreToolUse` array — don't overwrite other settings.
+If the settings file already exists, merge the hook into the existing `hooks.PreToolUse` array. Don't overwrite other settings.
 
 ### 4. Ask about customization