I still see a lot of confusion around the Cardano's partner-chain system. Grok please break it down... Cardano’s partner chain system lets independent blockchains, such as Midnight (its first, focused on programmable privacy and selective disclosure via zero-knowledge proofs), run their own specialized ledgers and consensus while inheriting security and decentralization by integrating Cardano Stake Pool Operators into their validator sets.⁠ Midnight operates as a Substrate-based partner chain with AURA/GRANDPA consensus and native interoperability (including asset bridges and state observation) with Cardano, enabling specialized features like shielded transactions while maintaining a “firewall” so risks on Midnight do not compromise Cardano’s mainchain. This expands Cardano’s overall ecosystem utility, adoption, and interoperability without adding complexity or risk to its mainchain.