feat(cli): add Bun compiled binary runtime asset management

Introduce runtime path abstraction for Bun-compiled binaries that extracts
assets to ~/.happy/runtime/{version} instead of using project paths. This
enables proper distribution of CLI as a self-contained binary with embedded
tools (ripgrep, difftastic) and scripts that are extracted at runtime.

cli/src/projectPath.ts

@@ -1,10 +1,24 @@
-import { dirname, resolve } from 'path';
+import { dirname, resolve, join } from 'path';
 import { fileURLToPath } from 'url';
+import { configuration } from '@/configuration';
+import packageJson from '../package.json';
 
 const __dirname = dirname(fileURLToPath(import.meta.url));
+const bunRuntime = (globalThis as typeof globalThis & { Bun?: { isCompiled?: boolean } }).Bun;
+const isCompiled = Boolean(bunRuntime?.isCompiled);
 
-export function projectPath() {
-    const path = resolve(__dirname, '..');
-    // console.log('path', path)
-    return path;
-}
+export function projectPath(): string {
+    return resolve(__dirname, '..');
+}
+
+export function runtimePath(): string {
+    if (!isCompiled) {
+        return projectPath();
+    }
+
+    return join(configuration.happyHomeDir, 'runtime', packageJson.version);
+}
+
+export function isBunCompiled(): boolean {
+    return isCompiled;
+}