bch(g2-c3): donation P2PK<->P2SH byte-correctness KAT - #876
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…->v36 flip Pins the donation script SSOT (core::donation::get_donation_script) byte-for-byte on both legs: v<36 = 67-byte BCH current-mainnet forrestv P2PK (guarded against a silent LTC/DASH-copied vector via the pubkey-prefix identity check), v>=36 = 23-byte combined 1-of-2 P2SH. Boundary pinned EXACTLY at version 36 (no off-by-one byte-offset-104 GENTX divergence). Guards the only G2-ratchet failure mode that is silent and reward-losing. Header-only, rig-free, gate-logic untouched. Wired into BCH_ABLA_TESTS and both build.yml COIN_BCH target lists; local ctest #266 PASS.
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G2-ratchet C3 (C3-FIRST per integrator GO 07-26). Guards the only G2-ratchet failure mode that is silent AND reward-losing: a wrong donation script across the P2PK<->P2SH flip pays the wrong destination with no gate error.
What it pins (byte-KAT over core::donation SSOT, independent hard-coded legs):
Discipline: KAT-only, no gate-logic change, header-only over <core/donation.hpp>. bitcoin_family/ and src/core/*.hpp untouched. Wired into BCH_ABLA_TESTS + both build.yml COIN_BCH target lists. Local ctest #266 PASS. GPG-signed 285EFE76. No self-merge — integrator merges on push approval.