# Phase 55 Summary

Status: implemented on `main`

## Goal

Materialize the first production paired-backend alignment and drift-audit
surface for the theoretical-physics backend pair.

## What Landed

- new `research/knowledge-hub/knowledge_hub/paired_backend_support.py`
  centralizes paired-backend role, debt, and drift-audit semantics
- `AITPService.paired_backend_audit(...)` now emits a production audit payload
  and durable runtime-side audit artifacts
- runtime `backend_bridges` entries are enriched with pairing role, pair member,
  pairing status, drift status, backend debt status, maintenance protocol path,
  and explicit semantic-separation metadata
- `capability_audit` now reports a paired-backend section
- CLI now exposes `aitp paired-backend-audit`

## Outcome

Phase `55` is complete.
The next active milestone step is Phase `56`
`h-plane-steering-and-approval-surface-consolidation`.
