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Argon2 on x86-64: prove address-cache state retention - #501
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Retain the filling allocation and represented matrix across independent-address regeneration. The address cache now has an index-independent invariant: counter zero allows arbitrary contents, and every nonzero counter identifies the exact specified address block. Advancing the index preserves that invariant, and it supplies the existing cache-selection precondition.
Prove regeneration retains the frame's public parameters and filling position, and leaves every matrix cell unchanged. Transport cache validity across register-only helpers and index advancement without assuming the previous or next index has a particular value.
Builds on #499. Proof composition only; no specification, TCB, public API or generated assembly changes.
Validation: targeted Lean builds, standard-axiom and compiler-override audits, specification-origin audit, Lean import/proof-speed checks, and
git diff --check. Full checks run in CI.