Address agnostic walking - #316
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Add a new marker types for a guest virutal addresses.
Introduce a `Translatable` trait which associates a virtual address kind with the physical kind it translates into (Virtual -> Physical, GuestVirtual -> GuestPhysical). Parametrise `PageTableMapper` over the physical address kind, defaulting to `Physical`.
Add `to_untyped` for guest address-types.
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Ensure the function pointers to the initcalls are properly aligned in the binary. If the pointers aren't properly aligned we fault very early in kernel boot, prior to the console being inialised.
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The latest Rust nightly (1.100.0-nightly 2026-08-20) elides the unused ptr::read of an invalid pointer even in debug builds, so the segfault children in test_segfault_read never faulted and exited normally, failing the WIFSIGNALED assertion in CI. Use read_volatile/write_volatile (and black_box the result) so the compiler cannot remove the faulting accesses. Also make the page-touch in test_mincore volatile for the same reason.
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