[Bug] Background task resumption causes Claude to restart turn after user interruption

Bug Description
background task coming back causes claude to start its turn again even after interruption

Environment Info

• Platform: darwin
• Terminal: ghostty
• Version: 2.1.83
• Feedback ID: db94591b-546e-4a7a-9dfa-4e0f32dbc4a7

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/owen/.local/share/claude/versions/2.1.83 (expected in multi-process scenarios)\n    at ibT (/$bunfs/root/src/entrypoints/cli.js:2735:2168)\n    at Zcq (/$bunfs/root/src/entrypoints/cli.js:2735:1326)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-03-26T00:10:38.406Z"}]