claude resolves the MCP server command against the child env (no PATH), so a
bare 'node' failed to spawn (status:failed). Use process.execPath. Also pass
--tools to drop claude's built-ins (Bash/Read/Write/…) — companion gets only
the four mcp__void__* tools.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>