The CRM Sync Engine I Had to Reverse‑Engineer: Two‑Step Fetches, 50‑Field Limits, and a Mapper That Refuses to Drift

I found the bug the way you always find the worst ones: not in a unit test, not in staging, but in a "why is this field blank again?" message after a real sync. The Zoho CRM API call looked correct. The request even included a fields parameter. And y...