test(setup-gbrain): the loopback Path 4 fixture over a local PGLite now reads local-stdio (#3539)

The owned Path 4 fixture registers its fake brain at 127.0.0.1 and then runs gbrain init --pglite in the same HOME. Under the #3539 rule a loopback HTTP entry over this machine's own engine is a local brain, so detect reports local-stdio there. free-suite (7) on PR #3727 (run 41231145675) failed on the old remote-http expectation.

Co-authored-by: capy-ai[bot] <230910855+capy-ai[bot]@users.noreply.github.com>

test/setup-gbrain-fixture.test.ts

@@ -114,7 +114,7 @@ describe('setup-gbrain owned Path 4 fixture', () => {
           expect(registration.exitCode).toBe(0);
           const after = await command(detectPath, [], env);
           expect(after.exitCode).toBe(0);
-          expect(JSON.parse(after.stdout).gbrain_mcp_mode).toBe('remote-http');
+          expect(JSON.parse(after.stdout).gbrain_mcp_mode).toBe('local-stdio');
           expect(JSON.parse(after.stdout).gbrain_engine).toBe('pglite');
           expect(JSON.parse(after.stdout).gbrain_local_status).toBe('ok');
           expect((await command(path.join(fixture.bin, 'claude'), ['mcp', 'remove', 'gbrain'], env)).exitCode).toBe(0);