[Bug] Ultraplan: Session creation failed during initialization

Bug Description
ultraplan always fail -> ultraplan: session creation failed. See --debug for details.

Environment Info

• Platform: darwin
• Terminal: tmux
• Version: 2.1.112
• Feedback ID: d4a0a388-516c-4cc0-9bec-a8378fe94b90

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/jmk/.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":"2026-04-17T02:15:20.430Z"},{"error":"AxiosError: Request failed with status code 503\n    at XU (/$bunfs/root/src/entrypoints/cli.js:110:1194)\n    at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:115:12736)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:865:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/src/entrypoints/cli.js:117:2467)\n    at async vg (/$bunfs/root/src/entrypoints/cli.js:2798:7244)\n    at async c05 (/$bunfs/root/src/entrypoints/cli.js:6373:102)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-17T02:15:34.055Z"},{"error":"AxiosError: Request failed with status code 503\n    at XU (/$bunfs/root/src/entrypoints/cli.js:110:1194)\n    at <anonymous> (/$bunfs/root/src/entrypoints/cli.js:115:12736)\n    at emit (node:events:92:22)\n    at endReadableNT (internal:streams/readable:865:50)\n    at processTicksAndRejections (native:7:39)\n    at request (/$bunfs/root/src/entrypoints/cli.js:117:2467)\n    at async vg (/$bunfs/root/src/entrypoints/cli.js:2798:7244)\n    at async c05 (/$bunfs/root/src/entrypoints/cli.js:6373:102)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-04-17T02:16:17.109Z"}]