refactor: deduplicate extension normalization primitives (#115650)

* refactor(plugins): reuse SDK normalization primitives

* fix(ci): repair code-mode matrix checks

* fix(ci): satisfy code-mode matrix gates

* fix(ci): use matrix evidence export

* fix(ci): validate matrix evidence artifact

extensions/reef/protocol/guard-adapters.ts

@@ -1,3 +1,4 @@
+import { isRecord } from "openclaw/plugin-sdk/channel-secret-basic-runtime";
 import { readProviderTextResponse } from "openclaw/plugin-sdk/provider-http";
 import {
   admitGuardAdapter,
@@ -200,7 +201,3 @@ function hasDuplicateKeys(text: string): boolean {
   }
   return false;
 }
-
-function isRecord(value: unknown): value is Record<string, unknown> {
-  return value !== null && typeof value === "object" && !Array.isArray(value);
-}