[Bug] Plan mode and Auto mode mutually exclusive on Max subscription

Bug Description
Plan mode and Auto mode cannot be used together on the Max subscription. Entering one blocks access to the other, with the error "Auto mode is not available for your subscription.

Environment Info

• Platform: darwin
• Terminal: kitty
• Version: 2.1.112
• Feedback ID: 9a90eb07-b71c-4fbe-bac6-4861436d08e5

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/hsn/.local/share/claude/versions/2.1.112 (expected in multi-process scenarios)\n    at Od_ (/$bunfs/root/src/entrypoints/cli.js:2748:2177)\n    at Ke6 (/$bunfs/root/src/entrypoints/cli.js:2748:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-17T11:21:21.854Z"}]