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/index.ts

@@ -27,9 +27,11 @@ import { spawnHappyCLI } from './utils/spawnHappyCLI'
 import { claudeCliPath } from './claude/claudeLocal'
 import { execFileSync } from 'node:child_process'
 import { initializeToken } from './ui/tokenInit'
+import { ensureRuntimeAssets } from './runtime/assets'
 
 
 (async () => {
+  ensureRuntimeAssets()
   const args = process.argv.slice(2)
 
   // If --version is passed - do not log, its likely daemon inquiring about our version