[Bug] `/reset` command resets effort level to default instead of preserving environment variable value

Bug Description
/reset を押すと、環境変数で指定していた effort の値が midium に戻ってしまう

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.1.81
• Feedback ID: 606620cb-3c06-428f-8ece-b331d6a600b4

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/takahiro.ikegawa/.local/share/claude/versions/2.1.81 (expected in multi-process scenarios)\n    at TET (/$bunfs/root/src/entrypoints/cli.js:2724:2174)\n    at fgq (/$bunfs/root/src/entrypoints/cli.js:2724:1318)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-24T13:16:20.855Z"}]