fix(isFromOwner): compare owner and sender addresses case-insensitively

[devorun]

Problem

isFromOwner compares the sender address to XMTP_OWNER_ADDRESS with strict ===:

if (senderAddress === ownerAddress) {

Ethereum addresses are case-insensitive. XMTP_OWNER_ADDRESS is provided by the user (commonly copied from a wallet or block explorer as an EIP-55 checksummed, mixed-case string), while ctx.getSenderAddress() returns the address in whatever casing the SDK produces. When the two casings differ, the strict comparison fails and the owner's own messages are silently ignored — the middleware locks the owner out of their own agent.

Fix

Compare the addresses case-insensitively, keeping the check undefined-safe so a missing sender address still fails closed:

if (senderAddress?.toLowerCase() === ownerAddress.toLowerCase()) {

Verified with the project's npm test (tsc --noEmit).

Note

Fix isFromOwner middleware to compare Ethereum addresses case-insensitively

Ethereum addresses can appear in mixed case (e.g. EIP-55 checksum format), so a strict equality check can incorrectly reject valid owners. isFromOwner.ts now lowercases both senderAddress and ownerAddress before comparing, and uses optional chaining on senderAddress to avoid errors when it is undefined.

^{Macroscope summarized cad444d.}