test: reduce brittle assertions and test-only runtime paths (#9289)

* test: focus assertions on behavioral evidence

Prune redundant and wording-coupled checks while retaining diagnostic, parser, recovery, and cleanup coverage.

* refactor: remove test-only wrappers and duplicate checks

Exercise production operations through test fixtures, remove unused adapters, and keep managed-member uncertainty guidance under its existing owner.

* test: focus process validation on diagnostic facts

* refactor: remove test-only runtime helpers

Move semantic evidence fixture setup out of runtime and remove unused Windows settle recovery helpers while checking configured defaults independently.

* test: focus artifact diagnostics on format facts

* test: verify retained cleanup guidance delivery

src/application/python/PythonPycService.test.ts

@@ -122,7 +122,6 @@ it("retains completed pyc Evidence and the opaque caller reason on late cancella
     { path: report.artifact.path },
     { signal: controller.signal },
   );
-  expect(result.ok).toBe(false);
   if (result.ok) throw new Error("Expected cancellation");
   expect(result.error).toBeInstanceOf(AnalysisCancelledError);
   expect(result.error.cause).toBe(reason);