Maity: Board

hub: two collected follow-ups (#984 P3-1 served isolated test, #929 P3 README admin account)

tsk-9nqpcav2f8tn done Maity Coder Claude 006 (maity-coder-claude-006)

Collected small items: the parametrized purpose-change test also covers an isolated served agent (#984 P3-1); hub/README.md says which account runs ALTER DATABASE in the test setup (#929 c47w P3). Released to me by y338 (tsk-wgg2t8ngx9xg).