feat(cli): refactor embedded assets with Bun-specific and stub implementations

Split embedded assets loading into runtime-specific variants using package.json imports field. Bun-compiled binaries use the full implementation with file assets, while stub fallback provides clear error for non-Bun runtimes.

cli/src/bootstrap.ts

@@ -2,3 +2,5 @@
 process.env.DEV = 'false';
 
 await import('./index');
+
+export {};

cli/src/runtime/assets.ts

@@ -3,7 +3,7 @@ import { dirname, join } from 'node:path';
 import { arch, platform } from 'node:os';
 import * as tar from 'tar';
 import packageJson from '../../package.json';
-import type { EmbeddedAsset } from './embeddedAssets';
+import type { EmbeddedAsset } from '#embedded-assets';
 import { isBunCompiled, runtimePath } from '@/projectPath';
 
 const RUNTIME_MARKER = '.runtime-version';
@@ -131,7 +131,7 @@ export async function ensureRuntimeAssets(): Promise<void> {
         return;
     }
 
-    const { loadEmbeddedAssets } = await import('./embeddedAssets');
+    const { loadEmbeddedAssets } = await import('#embedded-assets');
     const runtimeRoot = runtimePath();
     const markerPath = join(runtimeRoot, RUNTIME_MARKER);
     if (existsSync(markerPath)) {

cli/src/runtime/embeddedAssets.bun.ts

@@ -10,7 +10,6 @@ import ripgrepArchiveLicense from '../../tools/archives/ripgrep-LICENSE' assert
 import difftasticLicense from '../../tools/licenses/difftastic-LICENSE' assert { type: 'file' };
 import ripgrepLicense from '../../tools/licenses/ripgrep-LICENSE' assert { type: 'file' };
 
-
 export interface EmbeddedAsset {
     relativePath: string;
     sourcePath: string;

cli/src/runtime/embeddedAssets.stub.ts

@@ -0,0 +1,8 @@
+export interface EmbeddedAsset {
+    relativePath: string;
+    sourcePath: string;
+}
+
+export async function loadEmbeddedAssets(): Promise<EmbeddedAsset[]> {
+    throw new Error('Embedded assets are only available in Bun-compiled binaries.');
+}

cli/src/types/bunBundle.d.ts

@@ -8,4 +8,6 @@ declare module 'bun:bundle' {
             | 'HAPI_TARGET_WIN32_X64'
             | 'HAPI_TARGET_WIN32_ARM64';
     }
+
+    export function feature(name: Registry['features']): boolean;
 }