[Feature Request] ultrathink should default to MAX or XHIGH effort level

Bug Description
ultrathink should set effort to MAX or at the very least XHIGH as high is now the new middle option!

Environment Info

• Platform: linux
• Terminal: windsurf
• Version: 2.1.112
• Feedback ID: 7af2404c-cbb2-4764-b412-fe528243ee4a

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /home/azidan/.local/share/claude/versions/2.1.112 (expected in multi-process scenarios)\n    at qd$ (/$bunfs/root/src/entrypoints/cli.js:2750:2177)\n    at $e8 (/$bunfs/root/src/entrypoints/cli.js:2750:1257)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-17T00:14:53.575Z"}]