Exercise 1: GRUB Disappears Right After a Windows Feature Update — Possible Solution
====================================================================

WHAT MOST LIKELY HAPPENED
------------------------------
Per this chapter's own warn-box, "a Windows feature update can overwrite
the boot entry in the EFI System Partition, silently removing whatever
chainload configuration previously handed control to GRUB." The Windows
feature update most likely reasserted its own boot entry in the EFI
System Partition during installation, overwriting whatever
configuration was previously chainloading to GRUB - so now the system
boots straight into Windows Boot Manager with nothing left pointing to
GRUB at all.

WHY THIS ISN'T DELIBERATE OR MALICIOUS ON WINDOWS'S PART
------------------------------
Per this chapter, "Windows isn't being deliberately hostile to a
dual-boot setup; it's simply re-asserting its own boot entry as part of
a normal update, with no awareness that a second bootloader's own entry
existed at all." The Windows updater has no concept of GRUB or a
dual-boot configuration - from its own point of view, it's simply
making sure its own boot entry is correctly configured after a major
update, with no mechanism in place to check for or preserve an
unrelated bootloader's own entry.

WHY THIS MATCHES GRUB & MULTIBOOTING 6's OWN NAMED GOTCHA
------------------------------
That course already named this exact scenario as "the classic Windows-
Update-breaks-GRUB gotcha" - this chapter's own explanation is simply
the Windows-side account of the identical event that course already
described from GRUB's own perspective. Both courses are describing the
same real-world event, just from opposite sides of the boot process.

WHAT THIS MEANS FOR FIXING IT
------------------------------
Since the actual GRUB installation on disk hasn't been damaged or
removed - only the boot entry pointing to it - repairing this requires
restoring the chainload configuration in the EFI System Partition (the
exact recovery procedure GRUB & Multibooting 6 covers for exactly this
situation), rather than reinstalling GRUB itself from scratch.

WHY THIS WORKS AS AN ANSWER
------------------------------
It identifies the Windows update overwriting the EFI boot entry as the
specific cause using this chapter's own warn-box, explains why this
reflects an update behaving normally rather than acting against the
dual-boot setup deliberately, and connects the scenario directly back
to GRUB & Multibooting 6's own already-named version of the identical
problem.