fix: align workspace diagnostic contracts

backend/src/workspaces/schema.ts

@@ -25,7 +25,11 @@ export interface CanonicalDiagnostics {
     metadata: RestDiagnosticRequest & {
       response: { collection: string; dimensions: string; distance: string };
     };
-    reversible_probe?: RestDiagnosticRequest & { method: "POST" };
+    reversible_probe?: RestDiagnosticRequest & {
+      method: "POST";
+      auth: Exclude<DiagnosticAuthMode, "none">;
+      response: { operation: string };
+    };
   };
   embedding?: RestDiagnosticRequest & { response: { model: string; dimensions: string } };
 }
@@ -124,7 +128,11 @@ const vectorMetadataDiagnostic = restDiagnosticRequest.extend({
     distance: responseField,
   }).strict(),
 }).strict();
-const reversibleVectorProbe = restDiagnosticRequest.extend({ method: z.literal("POST") }).strict();
+const reversibleVectorProbe = restDiagnosticRequest.extend({
+  method: z.literal("POST"),
+  auth: z.enum(["bearer", "x-api-key"]),
+  response: z.object({ operation: responseField }).strict(),
+}).strict();
 const embeddingDiagnostic = restDiagnosticRequest.extend({
   response: z.object({ model: responseField, dimensions: responseField }).strict(),
 }).strict();