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Partial translator for arm8 and riscv contract conditions to BIR - #224
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…nditions to BIR (arm8_bir_condLib), generating bspec_max_pre/post and their relation theorems
…theory/tools/backlifter), support word arithmetic and casts, write ==> as a disjunction; examples/arm8/update_sat: generate BIR contract conditions with it; AGENTS.md: note the experimental translator
…eneration for isqrt example
…slator in *_spec_bir
…rm8 example to use it
…rom arm8 translator, port riscv examples isqrt and swap as tests
…y words, evaluate closed words to literals, widen equations on narrow fields; in kernel-trap, generate BIR contract conditions with the RISC-V translator
…_to_bir_thm (after checking new names are free); *_spec_bir scripts in translator examples reduce to val _ = calls, *_prop scripts use the new names
… translator examples use <c>_bir_def and bir_cont_* names
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This is a limited-scope proof-producing translator from a small subset of
boolused in arm8 and riscv contracts to BIR, trying to reuse the existing expression lifters as much as possible.