nmc(P0): embedded merge-mining foundation leaf — structure-only coin tree - #175
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Lay down src/impl/nmc/coin as the P0 structural foundation for embedded
merge-mined Namecoin under a BTC parent (DOGE-under-LTC analog):
header_chain.hpp (AuxPow header interface, parent-powhash path), block.hpp,
transaction.{hpp,cpp}, coin_smoke.cpp TU, plus CMake wiring (nmc_coin lib).
Fences (per integrator ACK msgid 5823428726...):
- btc tree READ-ONLY: NMC consumes src/impl/btc public header types only.
- AuxPow merkle-branch proof walk + block-validation = P0-DEFER stubs.
- vector<AuxChain> stays nmc-local; no lift into bitcoin_family/src/core.
- chain_id / auxpow_activation_height (cited ~19200) / genesis kept as -1
TO-CONFIRM sentinels, NOT compiled constants — pinning gated on VMID 219
nmc-testnet landing (chainparams + namecoind ground-truth).
nmc_coin smoke target builds clean (cmake --build --target nmc_coin, exit 0).
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P0 structural foundation for embedded merge-mined Namecoin under a BTC parent (DOGE-under-LTC analog). Lays down src/impl/nmc/coin: header_chain.hpp (AuxPow header interface + parent-powhash path), block.hpp, transaction.{hpp,cpp}, coin_smoke.cpp TU, CMake wiring (nmc_coin lib).
Fences (per integrator ACK):
Smoke gate: cmake --build --target nmc_coin → exit 0 (clean).