docs: update agent frontmatter permission example

packages/web/src/content/docs/agents.mdx

@@ -389,7 +389,10 @@ description: Code review without edits
 mode: subagent
 permission:
   edit: deny
-  bash: ask
+  bash:
+    "git diff": allow
+    "git log*": allow
+    "*": ask
   webfetch: deny
 ---