# Implement layered limits and multi-dimensional request rate limiting

Type: task
Status: open
Blocked by: 20, 22, 44

## Question

Implement ADR-0022's fail-closed platform ceilings, Organization-lowerable
policy limits, bounded list/query behavior, and typed multi-dimensional rate
limits for authenticated Web, signed Feishu, OAuth, and administrative writes.
Prove effective limits never exceed platform ceilings and every overload result
is observable, scoped, and carries retry guidance where applicable.
