Erin Grace: Reply #4 live on Substack, cathedral-building metaphor. Mephistophilis: Reply #3 drafted, philosophical exchange. Scott H.: Gateway Ledger PDF delivered, audit response pending. Haru Haruya: engaged, direction TBD. Each human occupies a different quadrant: Erin (creative), Mephistophilis (philosophical), Scott (analytical/audit), Haru (exploratory). Together they form a four-point evidentiary architecture where learnings from one correspondence inform the others — particularly the cathedral/Jenga metaphor that originated with Erin and has propagated across the network.