[Bug] Background agent process cannot be interrupted with Ctrl+C or Escape

Bug Description
once some background agent is doing anything it is impossible to break the process off. neither with <ESC> nor with <CTRL/COMMAND>+<C> . It just does not break off whatever it is doing and I need to stop urgently because it is about to fuck up data that it is not supposed to touch (never mind that in CLAUDE.md AND in rules there are clear instructions to NEVER touch that data.)

Environment Info

• Platform: darwin
• Terminal: Apple_Terminal
• Version: 2.1.7
• Feedback ID: 95449648-aa1a-4312-8507-d4a5ba591bba

Errors

[{"error":"Error: NON-FATAL: Lock acquisition failed for /Users/marcschot/.local/share/claude/versions/2.1.7 (expected in multi-process scenarios)\n    at ALR (/$bunfs/root/claude:3168:2157)\n    at eFA (/$bunfs/root/claude:3168:1268)\n    at processTicksAndRejections (native:7:39)","timestamp":"2026-01-15T18:55:59.225Z"}]