[Bug] Effort level not respecting `CLAUDE_CODE_EFFORT_LEVEL` environment variable when `xhigh` is default

Bug Description
Even with "CLAUDE_CODE_EFFORT_LEVEL": "max", effort is defaulted to xhigh starting in v2.1.111. However, if I set my default effort level to medium (the old default before this version) in ~/.claude/settings.json, I correctly start every session on max effort

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.1.111
• Feedback ID: c056935d-9726-43dc-9dc4-679f15555f45

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/Tyler Laprade/.local/share/claude/versions/2.1.111 (expected in multi-process scenarios)\n    at Kd_ (/$bunfs/root/src/entrypoints/cli.js:2748:2177)\n    at qe6 (/$bunfs/root/src/entrypoints/cli.js:2748:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-16T18:40:24.299Z"}]