refactor: delete the compatibility config surface

packages/styles/test/config.test.ts

@@ -7,7 +7,6 @@ import {
   resolveProfile,
   loadEnv,
   renderStyles,
-  resolveCompatibility,
   validateAppConfig,
   explainAppConfig,
 } from "../src/index.ts";
@@ -16,18 +15,6 @@ afterEach(() => {
   delete process.env.WRNEXUS_PROFILE;
 });
 
-test("compatibility dates pin behavior and reject invalid or future policies", () => {
-  expect(
-    resolveCompatibility({ compatibilityDate: "2026-08-02", frameworkBehaviour: 1 }),
-  ).toMatchObject({ needsUpgrade: false, future: false, effectiveBehaviour: 1 });
-  expect(validateAppConfig({ compatibilityDate: "2026-02-31" })).toContainEqual(
-    expect.objectContaining({ path: "compatibilityDate", severity: "error" }),
-  );
-  expect(validateAppConfig({ frameworkBehaviour: 2 })).toContainEqual(
-    expect.objectContaining({ severity: "error" }),
-  );
-});
-
 test("observability config requires bounded sampling and a valid OTLP endpoint", () => {
   expect(validateAppConfig({ observability: { sampleRate: Number.NaN } })).toContainEqual(
     expect.objectContaining({ path: "observability.sampleRate", severity: "error" }),