feat(Isla): Support named page-table roots - #239
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- Parse nested s1table and s2table blocks whose explicit bases are actual physical addresses.
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Keep code and translation-table allocations within dedicated 2 MiB arenas, and begin page-table data allocation after them.
- Parse nested s1table and s2table blocks whose explicit bases are actual physical addresses. - Reserve named roots and explicit table targets before allocating shared child-table pages. - Build code and page-table arena mappings in every root while keeping named roots available as term symbols. - Track Stage-2 roots separately and document the remaining Stage-2 descriptor-encoding work.
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