The allowedSenders had the Telnyx inbound number (+14157049277)
instead of the sender's phone number (+18322070387). This caused
all inbound SMS to be rejected since the sender wasn't in the allowlist.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
The sms-sites.json file was not in canonical format (sorted keys,
2-space indent, trailing newline), causing `npm run build` to fail
during the `check:content` step in Docker.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>