# Phase 54 Summary

Status: implemented on `main`

## Goal

Materialize the first explicit AITP control-plane contract in production code
and expose it through runtime, service, CLI, and capability-audit surfaces.

## What Landed

- new `research/knowledge-hub/knowledge_hub/control_plane_support.py` centralizes
  control-plane payload construction instead of smearing it across facades
- `runtime_protocol.generated.json` now includes an explicit `control_plane`
  section with distinct `task_type`, `lane`, `layer`, `mode`, transition, and
  `H-plane` state
- `topic_status`, `topic_next`, and `refresh_runtime_context` now surface the
  same control-plane truth
- `capability_audit` now reports a first-class `control_plane` section
- the progressive-disclosure runtime schema now contracts the new surface

## Outcome

Phase `54` is complete.
The next active milestone step is Phase `55` `paired-backend-alignment-and-drift-audit`.
