Document a pre-existing nested-EGL crash found while verifying the lock screen

Attempted to screenshot the redesigned lock screen in a disposable nested
compositor instance; the nested instance's own EGL context was lost the
moment the lock engaged, before any frame rendered. Reproduced the exact
same crash on the immediately prior commit, which never touches the lock
screen, confirming this is pre-existing sandbox/EGL flakiness (already
visible as transient BAD_ALLOC errors during ordinary nested startup, not
something this change introduced) rather than a lock-screen regression.

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