v0.2.0

• audit: --chain-ids 1,8453,42161 scans several chains in one call. Result now carries chainIds, a chains[] array with per-chain scanned / totals (or error when a chain fails while the others still return), global totals with chainsScanned / chainsFailed, and every allowance entry carries its chainId.
• --chain-id still works as a shorthand; --from-block is single-chain only.
• Breaking: top-level scanned moved under chains[].