# Roadmap: v1.79 Hypothesis Route Transition Gate Surface

## Result

`v1.79` is complete.

## Overview

`v1.79` closed the next post-`v1.78` research-control gap around
hypothesis-aware route transition gating. It derived one bounded
`route_transition_gate` summary from the current route choice plus the active
checkpoint/helper state, surfaced blocked versus available versus
checkpoint-required yielding through runtime status and replay, and proved the
bounded coexistence path with a dedicated isolated acceptance lane.

**Phases:** 153
**Total Plans:** 1
**Total Tasks:** 2
**Shipped:** 2026-04-12

## Phase Details

### Phase 153: Hypothesis Route Transition Gate Surface

**Goal:** Add one durable route transition-gate summary for the current local
route versus the primary handoff candidate and expose it through
runtime/read-path/replay flows without auto-mutating runtime state.

**Plans:** 1 plan

Plans:

- [x] `153-01`: add route transition-gate summary to runtime/replay surfaces
  and isolated acceptance

**Outcome:**

- landed `route_transition_gate` payload construction and rendering on the
  runtime/read-path layer
- surfaced blocked versus available versus checkpoint-required yielding through
  runtime status, the runtime protocol note, and replay
- aligned schema, docs, and isolated acceptance coverage for the bounded route
  transition-gate path

## Milestone Summary

**Key Accomplishments:**

- route choice and active operator-checkpoint state now join into one explicit
  route transition-gate summary
- runtime status and replay now keep the gate artifact visible without
  replacing route choice or helper mechanisms
- one isolated acceptance lane now proves blocked, directly-available, and
  checkpoint-gated yielding stay declarative and do not mutate runtime state

**Issues Resolved:**

- closed the gap where operators could see route choice but still had to infer
  whether yielding was actually blocked, available, or human-checkpoint-gated
- closed the gap where the current route-choice surface and the operator
  checkpoint surface still had to be mentally stitched together to understand
  transition eligibility

**Issues Deferred:**

- explicit transition intent after the gate becomes available
- automatic candidate reactivation and parent-topic reintegration mutation
- automatic branch spawning and multi-branch scheduling

**Technical Debt / Honest Gaps:**

- the first slice makes route-transition gating visible, but it does not yet
  materialize one explicit source-to-target transition intent surface after the
  gate clears

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For current planning state after `v1.79`, continue from the next fresh
milestone definition.
