Introducing MirrorNodeAccountBalanceQuery: The SDK-Native Migration Path for AccountBalanceQuery

Hedera’s MirrorNodeAccountBalanceQuery adds a native SDK method to read HBAR balances from the Mirror Node, replacing the deprecated AccountBalanceQuery. Available now in JavaScript, Java, and Go, it supports multiple ID formats, automatic retries, and zero query cost. The migration is mandatory on testnet/mainnet with Consensus Node v0.77, requiring a two-line code update and using setAccountId for all balance reads. Expect slight post-transaction propagation delays; update SDKs and test on testnet first.