test(tools): polish image auth regression and fix agents vitest routing

test/scripts/test-projects.test.ts

@@ -936,6 +936,24 @@ describe("scripts/test-projects changed-target routing", () => {
     expect(repoSourceReads.length).toBeLessThan(100);
   });
 
+  it.each([
+    "test/vitest/vitest.agents-core.config.ts",
+    "test/vitest/vitest.agents-pi-embedded.config.ts",
+    "test/vitest/vitest.agents-support.config.ts",
+    "test/vitest/vitest.agents-tools.config.ts",
+  ])("routes split agents vitest config %s to itself", (target) => {
+    const plans = buildVitestRunPlans([target], process.cwd());
+
+    expect(plans).toEqual([
+      {
+        config: target,
+        forwardedArgs: [],
+        includePatterns: null,
+        watchMode: false,
+      },
+    ]);
+  });
+
   it.each([
     "src/gateway/gateway.test.ts",
     "src/gateway/server.startup-matrix-migration.integration.test.ts",