# Phase 155: Hypothesis Route Transition Receipt Surface

## Status

complete

## Goal

Close the next post-`v1.80` gap by turning enacted route handoff into an
operator-visible transition-receipt surface.

## Background

AITP already has:

- question-level `competing_hypotheses`
- bounded `route_activation`, `route_reentry`, `route_handoff`, and
  `route_choice` visibility
- bounded `route_transition_gate` visibility
- bounded `route_transition_intent` visibility

But it still lacks one explicit place to say:

- whether the intended source-to-target handoff has actually been enacted
- which durable artifact is the receipt for that completed handoff
- how the enacted handoff relates back to the prior transition intent
- how that receipt coexists with the current transition-intent and helper
  mechanisms

## Requirements

- derive one bounded route transition-receipt summary from route transition
  intent plus enacted runtime state
- expose route-transition receipt through runtime/read-path/replay surfaces
- keep the transition-receipt surface coexistence with current transition-intent
  and helper mechanisms
- add one isolated acceptance lane for the bounded transition-receipt path

## Depends On

Phase 154 (`v1.80` route transition-intent visibility must remain closed and
available as the base layer)

## Deliverables

1. hypothesis route transition-receipt runtime surface
2. replay/read-path visibility for explicit enacted route handoff receipt
3. isolated acceptance and aligned docs/tests

## Plans

- [x] `155-01`: add route transition-receipt summary to runtime/replay surfaces
  and isolated acceptance
