[BUG] Session pegs a full CPU core indefinitely after its worktree is deregistered

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

Repro shape: a wt-cleanup session removed its own worktree registration; the directory remained but git worktree list no longer showed it; the session then spun
Ended only by Stop-Process -Force

What Should Happen?

Dispatch should stop repeatedly replying.

Error Messages/Logs

Measurements: 43,961 CPU-seconds over 14.7 hours, sustained 1.07 CPU-sec per wall-second, zero output. Survived the Dispatch STOP — so it's independent of that bug

Steps to Reproduce

a wt-cleanup session removed its own worktree registration; the directory remained but git worktree list no longer showed it; the session then spun

Claude Model

Opus

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

2.1.226

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

PowerShell

Additional Information

Claude Code (native CLI): 2.1.226
Claude Desktop: 1.26832.0.0
Bundled CLI: 2.1.222
OS: Windows 11 Home 10.0.26200
Model: Opus 5