refactor: delete the compatibility config surface

packages/styles/src/config.ts

@@ -17,11 +17,6 @@ import type { StorageConfig } from "@wrnexus/uploader";
 import type { BrowserCookiesConfig, ThemeConfig } from "./theme.ts";
 import type { FontConfig } from "./fonts.ts";
 import { fontCspSources } from "./fonts.ts";
-import {
-  isCompatibilityDate,
-  resolveCompatibility,
-  type CompatibilityPolicy,
-} from "./compatibility.ts";
 
 export type Mode = "development" | "production";
 
@@ -230,23 +225,12 @@ export interface TypesConfig {
   globalTypes?: string;
 }
 
-export interface FunctionsConfig {
-  legacyDefaultRuntime?: "current" | "client" | "server" | "shared";
-}
-
 export interface StoresConfig {
   strictMutations?: boolean;
   persistence?: boolean;
 }
 
-export interface CompatibilityConfig {
-  legacyEmit?: boolean;
-  legacyEventProps?: boolean;
-  legacyComponentDiscovery?: boolean;
-  stringLayouts?: boolean;
-}
-
-export interface AppConfig extends CompatibilityPolicy {
+export interface AppConfig {
   /** Ordered reusable configuration layers; the application always has final precedence. */
   extends?: string | string[];
   /** Compiler/dev/build plugins, resolved in deterministic pre/normal/post order. */
@@ -260,12 +244,8 @@ export interface AppConfig extends CompatibilityPolicy {
   imports?: ImportsConfig;
   /** TypeScript-backed .wrn type checking and declaration generation. */
   types?: TypesConfig;
-  /** Legacy function runtime behavior for existing applications. */
-  functions?: FunctionsConfig;
   /** Typed global/page store behavior. */
   stores?: StoresConfig;
-  /** Temporary v0.5 syntax compatibility switches. */
-  compatibility?: CompatibilityConfig;
   /** Opt-in APIs that are not yet covered by stable compatibility guarantees. */
   experimental?: ExperimentalConfig;
   /** Route and asset budgets plus build analyzer behavior. */
@@ -597,32 +577,23 @@ export function defineConfig(config: AppConfig): AppConfig {
   return config;
 }
 
+const REMOVED_CONFIG_KEYS = [
+  "compatibilityDate",
+  "frameworkBehaviour",
+  "functions",
+  "compatibility",
+] as const;
+
 export function validateAppConfig(config: AppConfig): ConfigIssue[] {
   const issues: ConfigIssue[] = [];
-  if (config.compatibilityDate !== undefined && !isCompatibilityDate(config.compatibilityDate)) {
-    issues.push({
-      path: "compatibilityDate",
-      severity: "error",
-      message: "must be a real ISO calendar date in YYYY-MM-DD format",
-    });
-  }
-  if (
-    config.frameworkBehaviour !== undefined &&
-    (!Number.isInteger(config.frameworkBehaviour) || config.frameworkBehaviour < 1)
-  ) {
-    issues.push({
-      path: "frameworkBehaviour",
-      severity: "error",
-      message: "must be a positive integer",
-    });
-  }
-  const compatibility = resolveCompatibility(config);
-  if (compatibility.future) {
-    issues.push({
-      path: "compatibilityDate",
-      severity: "error",
-      message: "targets framework behavior newer than this version supports",
-    });
+  for (const key of REMOVED_CONFIG_KEYS) {
+    if ((config as Record<string, unknown>)[key] !== undefined) {
+      issues.push({
+        path: key,
+        severity: "error",
+        message: "was removed; delete it from the configuration",
+      });
+    }
   }
   const sampleRate = config.observability?.sampleRate;
   if (