fix(spec-parser): add missing stubs in remote reference unit test

[Copilot]

The unit test SpecParser > validate > should return an error result object if contain remote reference was failing with AssertionError: expected 'spec-not-valid' to equal 'remote-ref-not-supported'.

Root cause: The test only stubbed parser.validate but left parser.parse, parser.dereference, and parser.$refs.paths unstubbed. At test runtime, dereference() made a real network request to resolve the remote $ref URL, failed, and the catch block returned ErrorType.SpecNotValid before execution ever reached the refPaths.length > 1 guard that emits ErrorType.RemoteRefNotSupported.

Fix: Added the three missing stubs, consistent with every other test in the same suite and the equivalent browser test:

sinon.stub(specParser.parser, "parse").resolves(spec as any);
sinon.stub(specParser.parser, "dereference").resolves(spec as any);
sinon
  .stub(specParser.parser.$refs, "paths")
  .returns(["localPath", "https://petstore3.swagger.io/api/v3/openapi.json"]);

The $refs.paths stub returns two entries (local + remote) so the > 1 check fires and the correct error type is produced.