Apply multi-model-tiering control API patch to tasks.paralla.org

Control API patch drafted in projects/multi-model-tiering/control_api_patch.md but not yet applied. Phase 1 routing layer needs this to function. Next milestone per project plan: “Apply control_api_patch.md to tasks.paralla.org control plane codebase”.

Note (2026-06-28T23:11:51Z)

Picked up by autopilot at 2026-06-28T23:58 BNE. Plan: Read task page for full context, understand what API patch is needed, locate tasks.paralla.org codebase, and apply the change.