# Host-Bridge Runtime Roadmap Design

> Date: 2026-04-19
> Parent Sequence: `2026-04-19-final-2-residual-child-plan-sequence-plan.md`
> Fixed Scene: `sweep-085-scene`

## Intent

Close or narrow the remaining host-bridge runtime residual without resurrecting the old G6 semantics micro-plan chain.

## Fixed Scope

Only `sweep-085-scene` is in scope.

## Minimal Success Definition

The scene must either:

1. become `framework-auto-pass-candidate`; or
2. remain `framework-structured-fail-closed` with a narrower named host-bridge runtime hold.

## Forbidden Scope

1. no general host-runtime transport implementation
2. no new G6 semantics micro-plan
3. no changes to G1-E/G2/G3 routes
4. no new family