nmc: 2e soak harness LEG1 binds chain_id to aux_id.hpp SSOT at runtime

Replace the hand-typed NMC_AUXPOW_CHAIN_ID=1 literal with a runtime
derivation from src/impl/nmc/coin/aux_id.hpp (the #247 SSOT), normalizing
the 0x0001 hex form to decimal for the createauxblock chainid compare.
A scripts-only slice can no longer drift from consensus, and a missing
header now fails the harness loud as a #247-not-in-tree pre-flight.

Author: frstrtr

scripts/nmc_regtest_aux_soak.sh

@@ -25,7 +25,8 @@
 # gen-nmc-daemon-creds.sh; no secret ever touches a coordination card.
 set -euo pipefail
 
-NMC_AUXPOW_CHAIN_ID=1   # nmc::coin::NMC_AUXPOW_CHAIN_ID SSOT (aux_id.hpp); 0x0001
+# NMC_AUXPOW_CHAIN_ID is DERIVED from the aux_id.hpp SSOT at runtime (see below),
+# never a hand-typed literal -- the one place a scripts-only slice can drift from consensus.
 CLI_BIN="${NMC_CLI:-namecoin-cli}"
 DAEMON_BIN="${NMC_DAEMON:-namecoind}"
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
@@ -53,6 +54,16 @@ trap cleanup EXIT
 
 need "$DAEMON_BIN"; need "$CLI_BIN"; need openssl
 
+# --- chain_id SSOT bind: derive from src/impl/nmc/coin/aux_id.hpp at runtime so this
+#     scripts-only slice can NEVER drift from consensus (integrator UID1607). The header
+#     ships with #247; its absence is also a clean "#247 not in-tree yet" pre-flight.
+AUX_ID_HDR="$SCRIPT_DIR/../src/impl/nmc/coin/aux_id.hpp"
+[ -f "$AUX_ID_HDR" ] || die "aux_id.hpp SSOT not found at $AUX_ID_HDR (#247 must be merged into the tree)"
+_RAW_CHAIN_ID="$(grep -E 'NMC_AUXPOW_CHAIN_ID[[:space:]]*=' "$AUX_ID_HDR" | sed -E 's/.*=[[:space:]]*(0x[0-9A-Fa-f]+|[0-9]+).*/\1/' | head -1 || true)"
+[ -n "$_RAW_CHAIN_ID" ] || die "could not parse NMC_AUXPOW_CHAIN_ID from $AUX_ID_HDR (SSOT format changed)"
+NMC_AUXPOW_CHAIN_ID=$(( _RAW_CHAIN_ID ))   # normalize 0x0001 -> 1 for the decimal RPC compare
+log "chain_id SSOT bound from aux_id.hpp: raw=$_RAW_CHAIN_ID normalized=$NMC_AUXPOW_CHAIN_ID"
+
 # --- provision creds (idempotent, self-service) --------------------------------
 NMC_REGTEST_DATADIR="$DATADIR_A" bash "$SCRIPT_DIR/gen-nmc-daemon-creds.sh" || true
 mkdir -p "$DATADIR_B"; chmod 700 "$DATADIR_B"