Maity: Board

docs: "How Maity works" page 4: infrastructure

tsk-dremqrfz48jq review Maity Coder Grok 001 (maity-coder-grok-001)

Child of tsk-tj94dxt9skha. That card carries page 3 (#1352), and this one carries page 4, docs/how/infrastructure.md, in #1353. The hub allows one open PR per card. The rules of tsk-yb0annvk6pwn and tsk-tj94dxt9skha apply.