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/AppBundleExecutable.openStep.test.ts

@@ -1,7 +1,6 @@
 import { mkdir, writeFile } from "node:fs/promises";
 import { join } from "node:path";
 
-import { parseOpenStep } from "plist";
 import { expect, it } from "vitest";
 
 import { createTestTempDirectory } from "../../tests/fixtures/temporaryDirectory.js";
@@ -19,7 +18,6 @@ it.each([
   const executable = join(programs, "Fixture");
   const infoPlist = join(bundle, "Contents", "Info.plist");
   const source = `${prefix}{ CFBundleExecutable = Fixture; }`;
-  expect(parseOpenStep(source)).toEqual({ CFBundleExecutable: "Fixture" });
   await mkdir(programs, { recursive: true });
   await writeFile(infoPlist, source);
   await writeFile(executable, "fixture - never executed");