copy / copy/v86

XV6 hard crashes when low memory, instead of a graceful panic.

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Description

Version: [ccb5e1ce](https://github.com/copy/v86/commits/ccb5e1ce) (Sep 20, 2025 11:09)
In QEMU, XV6 fails with the following error when low on memory (for instance, 128 MB)
```
lapicid 0: panic: userinit: out of memory?
80103b0d 801031e7 0 0 0 0 0 0 0 0
```
Under v86, the clock drops to 0 and nothing more comes from the operating system.
Images: https://github.com/Rodmatronic/compiledxv6

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