feat(memory): allow QMD searches via mcporter keep-alive (openclaw#19617) thanks @vignesh07

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: vignesh07 <1436853+vignesh07@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/memory/embeddings.ts

@@ -185,7 +185,9 @@ export async function createEmbeddingProvider(
           continue;
         }
         // Non-auth errors (e.g., network) are still fatal
-        throw new Error(message, { cause: err });
+        const wrapped = new Error(message) as Error & { cause?: unknown };
+        wrapped.cause = err;
+        throw wrapped;
       }
     }
 
@@ -228,7 +230,9 @@ export async function createEmbeddingProvider(
           };
         }
         // Non-auth errors are still fatal
-        throw new Error(combinedReason, { cause: fallbackErr });
+        const wrapped = new Error(combinedReason) as Error & { cause?: unknown };
+        wrapped.cause = fallbackErr;
+        throw wrapped;
       }
     }
     // No fallback configured - check if we should degrade to FTS-only
@@ -239,7 +243,9 @@ export async function createEmbeddingProvider(
         providerUnavailableReason: reason,
       };
     }
-    throw new Error(reason, { cause: primaryErr });
+    const wrapped = new Error(reason) as Error & { cause?: unknown };
+    wrapped.cause = primaryErr;
+    throw wrapped;
   }
 }