fix: Validate guest address ranges for overlapping regions in map_region#1369
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Closes #1289 Signed-off-by: Richard Durkee <Richard-Durkee@users.noreply.github.com>
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Add overlap validation to HyperlightVm::map_region to enforce the safety contract documented on VirtualMachine::map_memory, which requires that memory regions must not overlap.
The check validates the new region against:
Add Overlapping variant to MapRegionError with a descriptive message showing both the new and conflicting ranges.
Add four tests covering: