v0.7.4

Fixed

• Windows: Assertion failed: !(handle->flags & UV_HANDLE_CLOSING) crash on exit. Every relay-ai command on Windows printed an ugly libuv assertion failure during process teardown. The entry point called process.exit() immediately, force-tearing-down libuv handles (stdin listeners, native keyring module) that were still mid-cleanup. Replaced with a graceful shutdown: set process.exitCode and let the event loop drain naturally, with an unref'd safety timer as a fallback.
• Windows: multi-word CLI arguments silently truncated when launching Claude Code. launchClaude spawns claude.cmd with { shell: true } (required for .cmd files), but Node's spawn does not escape arguments in shell mode. cmd.exe re-tokenizes on whitespace, so relay-ai claude -p "What is 7 times 8?" reached Claude Code as just What. Replaced child_process.spawn with cross-spawn, which handles .cmd resolution and argument escaping internally without shell: true. Verified on a live Windows install: multi-word prompts now arrive intact as a single argument.