826-line doc covering: tech stack, tenancy hierarchy, full message
pipeline (G1+G2), all 55 DB models with field descriptions, 4 auth
realms, all API endpoints, member portal routes, AI dev handoff spec
(queue payloads + how to write ContentDraft output back), environment
variables, repo structure, migration workflow, and known gaps.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
