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/modules/difftastic/index.ts

@@ -5,7 +5,7 @@
 import { spawn } from 'child_process';
 import { join, resolve } from 'path';
 import { platform, arch } from 'os';
-import { projectPath } from '@/projectPath';
+import { runtimePath } from '@/projectPath';
 
 export interface DifftasticResult {
     exitCode: number
@@ -23,7 +23,7 @@ export interface DifftasticOptions {
 function getBinaryPath(): string {
     const platformName = platform();
     const binaryName = platformName === 'win32' ? 'difft.exe' : 'difft';
-    return resolve(join(projectPath(), 'tools', 'unpacked', binaryName));
+    return resolve(join(runtimePath(), 'tools', 'unpacked', binaryName));
 }
 
 /**
@@ -69,4 +69,4 @@ export function run(args: string[], options?: DifftasticOptions): Promise<Diffta
             reject(err);
         });
     });
-}
+}

cli/src/modules/ripgrep/index.ts

@@ -4,7 +4,7 @@
 
 import { spawn } from 'child_process';
 import { join, resolve } from 'path';
-import { projectPath } from '@/projectPath';
+import { runtimePath } from '@/projectPath';
 
 export interface RipgrepResult {
     exitCode: number
@@ -17,7 +17,7 @@ export interface RipgrepOptions {
 }
 
 export function run(args: string[], options?: RipgrepOptions): Promise<RipgrepResult> {
-    const runnerPath = resolve(join(projectPath(), 'scripts', 'ripgrep_launcher.cjs'));
+    const runnerPath = resolve(join(runtimePath(), 'scripts', 'ripgrep_launcher.cjs'));
     return new Promise((resolve, reject) => {
         const child = spawn(process.execPath, [runnerPath, JSON.stringify(args)], {
             stdio: ['pipe', 'pipe', 'pipe'],