# Phase 161: Hypothesis Route Transition Followthrough Surface

## Status

complete

## Goal

Close the next post-`v1.86` gap by turning transition clearance into an
operator-visible transition-followthrough surface.

## Background

AITP already has:

- question-level `competing_hypotheses`
- bounded `route_activation`, `route_reentry`, `route_handoff`, and
  `route_choice` visibility
- bounded `route_transition_gate`, `route_transition_intent`,
  `route_transition_receipt`, `route_transition_resolution`,
  `route_transition_discrepancy`, `route_transition_repair`,
  `route_transition_escalation`, and `route_transition_clearance` visibility

But it still lacks one explicit place to say:

- what bounded transition work should resume immediately after clearance
- which route artifact or repair ref is the authoritative follow-through target
- how that follow-through relates back to the current clearance state
- how that follow-through coexists with the current helper mechanisms

## Requirements

- derive one bounded route transition-followthrough summary from route
  transition clearance plus existing transition refs
- expose route-transition followthrough through runtime/read-path/replay
  surfaces
- keep the transition-followthrough surface coexistence with current
  transition-clearance and helper mechanisms
- add one isolated acceptance lane for the bounded transition-followthrough
  path

## Depends On

Phase 160 (`v1.86` route transition-clearance visibility must remain closed
and available as the base layer)

## Deliverables

1. hypothesis route transition-followthrough runtime surface
2. replay/read-path visibility for explicit bounded transition-followthrough
   state
3. isolated acceptance and aligned docs/tests

## Plans

- [x] `161-01`: add route transition-followthrough summary to runtime/replay
  surfaces and isolated acceptance
