docs: define SaaS capacity controls

2026-07-10 12:07:08 +08:00
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+# Implement layered limits and multi-dimensional request rate limiting
+
+Type: task
+Status: open
+Blocked by: 20, 22
+
+## 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.