# Requirements: v1.81 Hypothesis Route Transition Receipt Surface

## Milestone Goal

Close the next post-`v1.80` research-control gap so AITP can turn completed
route handoff into one operator-visible transition receipt, instead of forcing
operators to infer that the intended source-to-target transition has already
been enacted.

## Completed Requirements

### Route Transition-Receipt Surface

- [x] `REQ-HRECEIPT-01`: runtime surfaces can materialize a bounded route
  transition-receipt summary from route transition intent plus enacted runtime
  state.
- [x] `REQ-HRECEIPT-02`: replay/read paths expose whether the intended handoff
  has been realized and where the durable receipt lives instead of leaving that
  receipt implicit.

### Coexistence Rule

- [x] `REQ-HRECEIPT-03`: the route transition-receipt surface coexists cleanly
  with the current route_transition_intent surface and helper mechanisms
  instead of auto-triggering new runtime mutation.

### Verification

- [x] `REQ-VERIFY-01`: the milestone closes with one bounded isolated
  route transition-receipt acceptance path plus targeted regression coverage
  for the new receipt surface.

## Requirement Outcomes

- `REQ-HRECEIPT-01`: validated through `route_transition_receipt` payload
  materialization on the active research contract plus runtime protocol
  rendering.
- `REQ-HRECEIPT-02`: validated through replay visibility for pending, recorded,
  and none transition receipt.
- `REQ-HRECEIPT-03`: validated through the bounded acceptance lane that keeps
  route transition receipt, route transition intent, and helper mechanisms
  visible without new runtime mutation.
- `REQ-VERIFY-01`: validated through the dedicated isolated acceptance lane and
  targeted replay/schema/runtime regression slices.

## Traceability

| Requirement | Phase | Status |
|-------------|-------|--------|
| REQ-HRECEIPT-01 | Phase 155 | Complete |
| REQ-HRECEIPT-02 | Phase 155 | Complete |
| REQ-HRECEIPT-03 | Phase 155 | Complete |
| REQ-VERIFY-01 | Phase 155 | Complete |
