Multi-Wallet Balance Matrix

Builds a grid of many wallets against many tokens, including the chain’s native coin, with a total under each column. Those totals are the reason this is a grid rather than a series of balance lookups — how much of a token you hold in total, spread across every address, is a question no per-wallet view can answer. Reads are queued as flat wallet-and-token pairs rather than nested loops, so concurrency is capped across the whole grid instead of per row: a twenty by twenty grid is four hundred reads, and firing that as twenty bursts of twenty gets refused. A dash means the balance could not be read, usually an address that is not a token on this chain, and is shown differently from a genuine zero. Wallets holding too little gas to send anything are flagged.