# Phase 157 Summary

Status: implemented in working tree

## Goal

Close the next post-`v1.82` gap by turning inconsistent route-transition state
into an operator-visible discrepancy surface instead of leaving operators to
discover mismatch by comparing many artifacts manually.

## What Landed

- route transition-discrepancy 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-discrepancy section in:
  - `research/knowledge-hub/knowledge_hub/kernel_markdown_renderers.py`
  - `research/knowledge-hub/knowledge_hub/runtime_bundle_support.py`
- replay support for present versus none route-transition discrepancy visibility
  in:
  - `research/knowledge-hub/knowledge_hub/topic_replay.py`
- public runtime-bundle schema coverage for `route_transition_discrepancy` 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_discrepancy_acceptance.py`
- new contract/runtime coverage in:
  - `research/knowledge-hub/tests/test_hypothesis_route_transition_discrepancy_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 `157` now closes the first bounded route transition-discrepancy slice:

- `status --json` and the runtime protocol note now surface one
  `route_transition_discrepancy` summary with `present` versus `none` states
- `replay-topic --json` exposes the same transition-discrepancy payload plus
  the discrepancy status on the active topic replay surface
- the new isolated acceptance proves AITP can explicitly flag inconsistent
  transition state when the resolved handoff outcome disagrees with upstream
  route artifacts, without widening into fresh runtime mutation
