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Took a pass over this after merging the spec clarifications from #346. Tightened the model to buffer opaque ciphertext and defer symbolic decryption until after both transcript verification and user approval, which better matches the spec's dual-consent gate. Added a few lemmas (injective agreement, buffer-then-decrypt sequencing, buffering reachability) and updated the spec section to name all sixteen with their preconditions. Also hardened a handful of SHOULD/MUST inconsistencies in the spec that surfaced during review — SAS denial is now a mandatory abort, payload zeroization is explicit, and the protocol_error reason is scoped to local faults only. All sixteen lemmas verify clean in about fifteen seconds. |
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