refactor: dedupe plugin lowercase helpers

src/infra/git-commit.ts

@@ -2,6 +2,7 @@ import fs from "node:fs";
 import { createRequire } from "node:module";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
+import { normalizeLowercaseStringOrEmpty } from "../shared/string-coerce.js";
 import { resolveGitHeadPath } from "./git-root.js";
 import { resolveOpenClawPackageRootSync } from "./openclaw-root.js";
 
@@ -17,7 +18,7 @@ const formatCommit = (value?: string | null) => {
   if (!match) {
     return null;
   }
-  return match[0].slice(0, 7).toLowerCase();
+  return normalizeLowercaseStringOrEmpty(match[0].slice(0, 7));
 };
 
 const cachedGitCommitBySearchDir = new Map<string, string | null>();