# HyperTwist Phase 6R-Q rubix-cube-solver solve explanation recommendation implementation packet

Created on `2026-05-23`

## Status

- first-party HyperTwist packet
- bounded permissive `Phase 6R-Q` implementation slice

## Purpose

This packet lands the current retained `rubix-cube-solver` solve explanation/recommendation
family:

- first-party classic-cube solve explanation profile and recommendation-state composition above the
  already landed reconstruction and browser-shell seams

It is not:

- a full `rubix-cube-solver` row transplant
- a bundled `twistysim.min.js` redistribution packet
- a generalized solver backend packet
- a broad multi-face correction shell packet
- a `qbr` multilingual shell packet

## Current authority basis

This implementation packet stands on:

- `docs/REPO_LICENSE_TRACKING.md`
- `docs/ops/HYPERTWIST_CROSS_LANE_AUTHORITY_HIERARCHY_AND_RECONCILIATION_2026-05-20.md`
- `docs/arch/HYPERTWIST_PHASE6R_Q_RUBIX_CUBE_SOLVER_SOLVE_EXPLANATION_RECOMMENDATION_PREPARATION_PACKET_2026-05-23.md`

The retained owner remains:

- `vivaansinghvi07/rubix-cube-solver`

The top-level product shell owner does not change here:

- first-party HyperTwist remains the broader recognition-session and product-shell owner
- this packet keeps `vivaansinghvi07/rubix-cube-solver` bounded to the narrower `A1 / R1 / F3`
  solve explanation/recommendation slice

## Landed scope

The current code now owns a retained `rubix-cube-solver` solve explanation/recommendation contract
through:

- first-party `HyperTwistRecognition` contract types for:
  - solve explanation step definition
  - solve explanation profile definition
  - solve explanation session-state readout
  - solve explanation profile id on recognition session config
  - commit result solve explanation payloads
- recognition session config defaults for:
  - first-party classic-cube solve explanation profile id
  - solve explanation profile definition
- first-party commit result shaping for:
  - explanation readiness after full reconstruction
  - recommendation stage and detail lines
  - bounded step count
  - start/previous/next visibility
  - playback deferred state
  - explicit full-reconstruction guard
- sample contract routing in:
  - `UHyperTwistContractLibrary`
- active subsystem normalization in:
  - `UHyperTwistTrainingSubsystem`
- focused automation coverage in:
  - `HyperTwistRubixCubeSolverPhase6RQSolveExplanationContractTest.cpp`

## Why this is still intentionally bounded

This packet lands the bounded solve explanation/recommendation seam, but it does not widen into
neighboring families or broader ownership.

Still excluded:

- bundled `twistysim.min.js` redistribution
- generalized solver backend ownership
- broad multi-face correction shell ownership
- `qbr` multilingual shell ownership
- `qbr` bundled-font redistribution

## Validation

Build validation:

- `C:\Program Files\Epic Games\UE_5.7\Engine\Build\BatchFiles\Build.bat UnrealHyperTwistEditor Win64 Development -Project='C:\HyperTwist\UnrealHyperTwist\UnrealHyperTwist.uproject' -WaitMutex -NoHotReloadFromIDE -NoUba`

Focused automation validation:

- `C:\Program Files\Epic Games\UE_5.7\Engine\Binaries\Win64\UnrealEditor-Cmd.exe C:\HyperTwist\UnrealHyperTwist\UnrealHyperTwist.uproject -unattended -nop4 -nosplash -NullRHI -log -stdout -FullStdOutLogOutput -AbsLog=C:\HyperTwist\UnrealHyperTwist\Saved\Logs\Phase6R-Q-Rubix-Verify.log -ReportExportPath=C:\HyperTwist\UnrealHyperTwist\Saved\AutomationReports\Phase6R-Q-Rubix-Verify -ExecCmds="Automation RunTests HyperTwist.Permissive.RubixCubeSolver.Phase6R.Q; Quit" -TestExit="Automation Test Queue Empty"`

Regression automation validation:

- `HyperTwist.Permissive.RubixCubeSolver.Phase6R.P`
- `HyperTwist.Permissive.RubixCubeSolver.Phase6R.C`
- `HyperTwist.Permissive.Qbr.Phase6R.O`
- `HyperTwist.CleanRoom.CubeDesk`

Expected covered tests:

- `SolveExplanationSessionConfig`
- `SolveExplanationPartialState`
- `SolveExplanationCompleteState`
- existing `rubix-cube-solver`, `qbr`, and `CubeDesk` regression suites

## Queue effect

This packet consumes the current `Phase 6R-Q` implementation slice.

`vivaansinghvi07/rubix-cube-solver` remains partially incorporated:

- landed now:
  - committed-face reconstruction session
  - face-vote replacement ledger
  - final classic-net shaping above aggregated committed faces
  - browser/webcam shell profile and browser-shell session-state composition
  - bounded solve explanation/recommendation stage ladder and recommendation state
- still deferred:
  - multi-face correction or explanation shell beyond the bounded stage ladder
  - bundled `twistysim.min.js` redistribution

The next clean move is:

- a source-backed retained classic-cube recognition multi-face correction/explanation
  preparation/control pass shared across `kkoomen/qbr` and `vivaansinghvi07/rubix-cube-solver`

Keep the future sequencing guards visible:

- do not copy or redistribute `frontend/lib/twistysim.min.js` without preserving or replacing its
  upstream provenance/license in any future widening that would ship that asset
- do not copy or redistribute `src/assets/arial-unicode-ms.ttf` without separate confirmation or
  replacement in any future widening that would ship that asset
