feat(bun-plugin): use native compiler by default

Retain the selected compiler across Bun setup, reservation, source extraction, CSS publication and delayed callbacks, with explicit WASM selection and no fallback.

Refs #686

Author: owjs3901

.changepacks/changepack_log_w74-native-engine.json

@@ -3,7 +3,8 @@
     "packages/plugin-utils/package.json": "Patch",
     "packages/webpack-plugin/package.json": "Patch",
     "packages/rsbuild-plugin/package.json": "Patch",
-    "packages/vite-plugin/package.json": "Patch"
+    "packages/vite-plugin/package.json": "Patch",
+    "packages/bun-plugin/package.json": "Patch"
   },
   "note": "Add shared native/WASM compiler selection, structural compiler types and exact native platform-load diagnostics for build plugins.",
   "date": "2026-10-30T17:29:00.000Z"

bun.lock

@@ -3,11 +3,12 @@ import './bun.matrix'
 import { afterEach, beforeEach, spyOn } from 'bun:test'
 
 import { resetWasmForTesting } from './packages/next-plugin/src/wasm'
-import { createModuleResolver } from './packages/plugin-utils/src'
+import { createModuleResolver, loadCompiler } from './packages/plugin-utils/src'
 
 const { resetStateForTesting, setDebug, setModuleResolver } =
   await import('./bindings/devup-ui-wasm/pkg/index.js')
 const testModuleResolver = createModuleResolver()
+const nativeCompiler = loadCompiler()
 const nativeBunPlugin = Bun.plugin
 export const bunRegistration = Object.assign(spyOn(Bun, 'plugin'), {
   clearAll: nativeBunPlugin.clearAll,
@@ -21,6 +22,9 @@ try {
 }
 
 function resetTestState() {
+  nativeCompiler.resetStateForTesting()
+  nativeCompiler.setDebug(true)
+  nativeCompiler.setModuleResolver(testModuleResolver)
   resetStateForTesting()
   setDebug(true)
   setModuleResolver(testModuleResolver)