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Thread ~mode through the isla converter so each model subcommand (seq/ump/vmp/x86_tso) merges [<mode>.registers.defaults] on top of the base table. This is plumbing for a later PR that turns on MMU in vmp (SCTLR_EL1=1, TTBR0_EL1, page tables) once the pgt-dsl / vmp-run-support chain lands — the overlay currently only adds TCR_EL1/ID_AA64MMFR1_EL1 at 0 so observable behavior is unchanged.
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[registers.defaults]is shared across all models, so anything vmp wants to set (e.g.ID_AA64MMFR1_EL1toselect FEAT_ETS / ETS2 translation semantics) would leak into seq or ump. This PR lets each model merge its own
[<mode>.registers.defaults]overlay on top.