# HyperTwist Phase 7C MagicTile native behavior proof preparation packet

Created on `2026-06-19`

## Status

- first-party HyperTwist packet
- bounded first-party `Phase 7C` preparation/control slice

## Purpose

This packet defines the next substantive but still bounded `MagicTile` move
after the landed `Phase 7A` embedded-browser host decision, `Phase 7B`
browser-state bridge, and the optional full-browser client spec packet.

The granted slice is:

- a first-party native behavior proof above the landed `MagicTile`
  browser-state bridge
- selected-cell focus, candidate-twist disambiguation, preview, commit or
  cancel, and timer-continuity proof surfaces
- explicit reuse of transport-neutral bridge/state vocabulary where that
  vocabulary already exists in first-party terms

It is not:

- a native spherical or hyperbolic renderer port
- a `WinForms` / `OpenTK` host-shell transplant
- a generic non-Euclidean runtime-base replacement
- a browser-host reversal away from the landed embedded-browser posture

## Current authority basis

This preparation packet stands on:

- `docs/ops/HYPERTWIST_COMPREHENSIVE_RECONSTRUCTION_ROADMAP_2026-06-10.md`
- `docs/v6_5_deep_manual_pack/HyperTwist/ROADMAP.md`
- `docs/v6_5_deep_manual_pack/HyperTwist/ARCHITECTURE.md`
- `docs/v6_5_deep_manual_pack/HyperTwist/FEATURE_REGISTRY.md`
- `docs/ops/HYPERTWIST_IMPLEMENTATION_PHASE_1_KICKOFF.md`

The key routing facts are:

- `Phase 7A` already chose the embedded browser/CEF shell as the live
  `MagicTile` host posture
- `Phase 7B` already established first-party tiling state envelopes, shared
  scramble normalization, and unified timer continuity across Unreal and the
  browser shell
- the real remaining pre-renderer gap is not another browser decision; it is a
  first-party native interaction/behavior proof that can later justify or deny
  a renderer port on evidence

## Granted family

The bounded `Phase 7C` slice may land:

1. a first-party native behavior proof contract
2. a first-party proof probe derived from the landed tiling state envelope
3. runtime-library accessors and JSON round-trip support for that proof probe
4. focused automation proving the proof seam without claiming renderer
   ownership

The packet must stay out of:

- renderer port ownership
- legacy host-shell ownership
- broad non-Euclidean shell replacement
- generic replay/runtime widening outside the landed bridge seam

## Proposed implementation shape

Land the proof through:

- a bounded native-behavior proof contract anchored to the landed browser host
  decision and browser-state bridge
- a compact proof probe carrying:
  - selected cell
  - candidate twist ids
  - preview token
  - committed twist id
  - shared scramble tokens/notation
  - puzzle-state and timer continuity
- normalization/serialization helpers so later renderer work can target a
  stable first-party proof seam
- focused `Phase 7C` automation over the proof contract and proof probe

## Validation target

Validate with:

- Windows Unreal build:
  - `Build.bat UnrealHyperTwistEditor Win64 Development -Project='C:\HyperTwist_worktrees\phase10validate\UnrealHyperTwist\UnrealHyperTwist.uproject' -WaitMutex -NoHotReloadFromIDE -NoUba`
- focused automation:
  - `Automation RunTests HyperTwist.FirstParty.MagicTile.Phase7C`
- regression guard:
  - `HyperTwist.FirstParty.MagicTile.Phase7A`
  - `HyperTwist.FirstParty.MagicTile.Phase7B`
  - `HyperTwist.Browser.*`

## Queue effect

If this packet lands cleanly:

- the native behavior question becomes evidence-backed instead of speculative
- later renderer-port widening remains a separate explicit decision packet
  rather than an automatic follow-on
