[Bug] `/sandbox` command displays dependencies but doesn't enable sandbox mode

Bug Description
/sandbox shows the installed dependencies but doesn't allow me to actually enable sandbox mode.

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.71
• Feedback ID: b8f21337-4a20-4b4c-ab7b-94d99679507d

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/ericbrookfield/.local/share/claude/versions/2.1.71 (expected in multi-process scenarios)\n    at Xxq (/$bunfs/root/src/entrypoints/cli.js:2603:2066)\n    at zU8 (/$bunfs/root/src/entrypoints/cli.js:2603:1210)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-08T01:45:04.071Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at tZ_ (/$bunfs/root/src/entrypoints/cli.js:2478:18454)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-08T01:45:04.091Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at tZ_ (/$bunfs/root/src/entrypoints/cli.js:2478:18454)\n    at async f (/$bunfs/root/src/entrypoints/cli.js:4594:16495)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-08T01:45:04.438Z"},{"error":"Error: Plugin MCP server error - mcp-config-invalid: MCP server github invalid: Missing environment variables: GITHUB_PERSONAL_ACCESS_TOKEN\n    at tZ_ (/$bunfs/root/src/entrypoints/cli.js:2478:18454)\n    at async X (/$bunfs/root/src/entrypoints/cli.js:4594:17211)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-08T01:45:04.439Z"}]

<img width="942" height="616" alt="Image" src="https://github.com/user-attachments/assets/544550fa-1050-472c-be24-4229f7aa14d8" />