Argon2 on x86-64: prove complete independent-address generation - #494
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Generate the complete independent-address block used by Argon2i and Argon2id. Clear the input and zero blocks, write the seven public address words, and call the verified G compression twice to produce exactly
Spec.Argon2.addressBlock.Prove the whole operation from arbitrary initial scratch contents, including memory permissions and separation, frames, callee-saved registers, MXCSR preservation, and equal traces for public frame, stack and scratch pointers. Compose short argument/clear/header proofs with the existing verified compression call boundary; no new contracts or trusted assumptions.
Builds on #490. This remains an inline layer for the forthcoming filling loops. No specification, TCB, public API or generated assembly changes.
Validation: targeted Lean builds of the correctness and trace modules, standard-axiom and compiler-override audits, specification-origin audit, Lean import/proof-speed checks, and
git diff --check. Full checks run in CI.