[Bug] Excessive latency or context length issues with single command processing

**Bug Description**
esto es una verguenza. llevo horas para qu eentienda un comando. uno.

**Environment Info**
- Platform: win32
- Terminal: windows-terminal
- Version: 2.1.266
- Feedback ID: cef1c48f-4108-4b8f-aa09-53890b4a2834

**Errors**
```json
[{"error":"TelemetrySafeError: VirtualMessageList: itemKeys/messages length desync (keys=262 messages=261 range=[231,262))\n at cJt (B:/~BUN/root/chunk-achrwd73.js:36:27844)\n at Zye (B:/~BUN/root/chunk-achrwd73.js:36:20655)\n at Br (B:/~BUN/root/chunk-h285wy21.js:18:20178)\n at Lu (B:/~BUN/root/chunk-h285wy21.js:18:38344)\n at Zh (B:/~BUN/root/chunk-h285wy21.js:18:84425)\n at Gg (B:/~BUN/root/chunk-h285wy21.js:18:83425)\n at nc (B:/~BUN/root/chunk-h285wy21.js:18:83254)\n at Gh (B:/~BUN/root/chunk-h285wy21.js:18:79779)\n at qe (B:/~BUN/root/chunk-h285wy21.js:18:6261)\n at ke (B:/~BUN/root/chunk-h285wy21.js:18:4792)","timestamp":"2026-09-10T10:48:04.578Z"}]
```

Start by reproducing the single-command failure on win32 in Windows Terminal with version 2.1.266, using feedback ID cef1c48f-4108-4b8f-aa09-53890b4a2834. Trace the reported VirtualMessageList itemKeys/messages length desync in the generated BUN chunks, and consider the issue done when the command completes without the reported error or the latency/context-length cause is identified.

Rédigé par le modèle d'indexation à partir du texte de l'issue.