# Phase 56 Summary

Status: implemented on `main`

## Goal

Materialize the first explicit `H-plane` production surface so redirect, pause,
approve, and override stop living only as scattered artifacts and commands.

## What Landed

- new `research/knowledge-hub/knowledge_hub/h_plane_support.py` centralizes
  steering, checkpoint, registry, and approval projection logic
- `AITPService.h_plane_audit(...)` now emits a production H-plane audit payload
  and durable runtime-side audit artifacts
- runtime bundle now exposes a first-class top-level `h_plane` payload
- `topic_status`, `topic_next`, and `refresh_runtime_context` now surface the
  same H-plane truth
- `capability_audit` now reports an `h_plane` section
- CLI now exposes `aitp h-plane-audit`

## Outcome

Phase `56` is complete.
The next active milestone step is Phase `57`
`control-plane-docs-doctor-parity-and-regression-closure`.
