The dexcore->dex refactor gutted the chain-label scan in AssertNoForbiddenAssetRefs
(it discarded chainLabel via '_ = chainLabel'), so the DEX startup gate no longer
refused a source chain labeled a 'Liquidity (white-label) universe' even though the
token was real on-chain — a regression of the never-mix-Liquidity boundary.
Restore the negative gate: IsForbiddenUniverseLabel scans the chain's human label for
forbidden off-network brands (liquid -> catches Liquid EVM/DEX/Liquidity; partner),
case-insensitive, and AssertNoForbiddenAssetRefs refuses by name. Positive ChainVerifier
proves existence; this polices brand. Closes the 3 regressed gate tests.
zeekay
e19c11951a