# Phase 160 Summary

Status: implemented in working tree

## Goal

Close the next post-`v1.85` gap by turning transition escalation into an
operator-visible transition-clearance surface instead of leaving operators to
infer whether an escalated transition is still blocked or has been released.

## What Landed

- route transition-clearance payload construction and runtime/read-path
  rendering in:
  - `research/knowledge-hub/knowledge_hub/runtime_read_path_support.py`
- runtime protocol rendering for the new transition-clearance section in:
  - `research/knowledge-hub/knowledge_hub/kernel_markdown_renderers.py`
  - `research/knowledge-hub/knowledge_hub/runtime_bundle_support.py`
- replay support for `none`, `awaiting_checkpoint`, `blocked_on_checkpoint`,
  and `cleared` transition-clearance visibility in:
  - `research/knowledge-hub/knowledge_hub/topic_replay.py`
- public runtime-bundle schema coverage for `route_transition_clearance` in:
  - `research/knowledge-hub/runtime/schemas/progressive-disclosure-runtime-bundle.schema.json`
- one new isolated acceptance lane:
  - `research/knowledge-hub/runtime/scripts/run_hypothesis_route_transition_clearance_acceptance.py`
- new contract/runtime coverage in:
  - `research/knowledge-hub/tests/test_hypothesis_route_transition_clearance_contracts.py`
  - `research/knowledge-hub/tests/test_runtime_scripts.py`
  - `research/knowledge-hub/tests/test_topic_replay.py`
  - `research/knowledge-hub/tests/test_schema_contracts.py`
- documentation and runbook updates across:
  - `research/knowledge-hub/README.md`
  - `research/knowledge-hub/runtime/README.md`
  - `research/knowledge-hub/runtime/AITP_TEST_RUNBOOK.md`

## Outcome

Phase `160` now closes the first bounded route transition-clearance slice:

- `status --json` and the runtime protocol note now surface one
  `route_transition_clearance` summary with `none`, `awaiting_checkpoint`,
  `blocked_on_checkpoint`, and `cleared` states
- `replay-topic --json` exposes the same transition-clearance payload plus the
  clearance status on the replay surface
- the new isolated acceptance proves AITP can make checkpoint-mediated
  transition release explicit without widening into fresh runtime mutation
