# HyperTwist Phase 6R-C rubix-cube-solver reconstruction implementation packet

Created on `2026-05-20`

## Status

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

## Purpose

This packet lands the first narrower bounded slice from the retained
`vivaansinghvi07/rubix-cube-solver` recognition-companion row.

The landed slice is:

- first-party classic-cube committed-face reconstruction session plus face-vote replacement ledger

It is not:

- a full `rubix-cube-solver` row transplant
- a browser/webcam shell packet
- a broad solve-explanation packet
- a bundled `twistysim.min.js` redistribution packet
- a `MagicTile` topology packet

## Current authority basis

This implementation packet stands on:

- `docs/HYPERTWIST_PHASE_0R_PACKET_0R_A_EVALUATION_2026-05-12.md`
- `docs/HYPERTWIST_PHASE_2R_PACKET_2R_A_OWNERSHIP_AND_ACCEPTANCE_CONTRACT_2026-05-13.md`
- `docs/REPO_LICENSE_TRACKING.md`
- `docs/arch/HYPERTWIST_PHASE6R_C_RUBIX_CUBE_SOLVER_RECONSTRUCTION_PREPARATION_PACKET_2026-05-20.md`

The retained owner remains:

- `vivaansinghvi07/rubix-cube-solver`

The granted family remains bounded to:

- committed-face reconstruction flow
- face-vote replacement and correction ledger
- bounded final net shaping above committed faces

This packet lands only the first narrower family in that granted set.

## Landed scope

The current code now owns a retained classic-cube reconstruction contract through:

- retained recognition contract types for:
  - sticker vote tallies
  - reconstruction sticker votes
  - committed face state
  - reconstruction session
- recognition session state tracking for the active reconstruction session
- classic-cube reconstruction-session aggregation and face-vote replacement in
  `UHyperTwistTrainingSubsystem`
- classic-cube missing-face accounting and confidence rollup derived from the bounded
  reconstruction session
- final classic facelet snapshot and net shaping when the six-face reconstruction becomes complete
- sample reconstruction-session routing in `UHyperTwistContractLibrary`
- ordered classic-face preview and commit payload correction in `UHyperTwistMockVisionClient`
- focused automation coverage in:
  - `HyperTwistRubixCubeSolverPhase6RCReconstructionContractTest.cpp`

## Why this is still intentionally bounded

This packet replaces the thinner commit/finalize reconstruction heuristics with a reconstruction
session owned by first-party code, but it does not widen into the neighboring retained families.

Still deferred:

- browser/webcam shell
- broad solve explanation or recommendation shell
- bundled `twistysim.min.js` redistribution
- generalized solver backend ownership
- `MagicTile` or broader topology widening

## Validation

Build validation:

- `Build.bat UnrealHyperTwistEditor Win64 Development -Project='C:\HyperTwist\UnrealHyperTwist\UnrealHyperTwist.uproject' -WaitMutex -NoHotReloadFromIDE`

Focused automation validation:

- `Automation RunTests HyperTwist.Permissive.RubixCubeSolver.Phase6R.C`

Regression automation validation:

- `Automation RunTests HyperTwist.Permissive.Qbr.Phase6R.B`
- `Automation RunTests HyperTwist.Permissive.Hyperspeedcube.Phase6R.A`
- `Automation RunTests HyperTwist.CleanRoom.CubeDesk`

Expected covered tests:

- `CommitBuildsReconstructionSession`
- `RevisionLedger`
- `FinalizeBuildsClassicNet`
- `CalibrationSessionConfig`
- `PreviewObservation`
- `CommitObservation`
- `CatalogLookup`
- `SampleDefinition`
- `TrainingRunDefinition`
- existing `CubeDesk` clean-room regression suite

## Queue effect

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

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

- landed now:
  - committed-face reconstruction session
  - face-vote replacement ledger
  - final classic-net shaping above aggregated committed faces
- still deferred:
  - browser/webcam shell
  - broad solve explanation or recommendation shell
  - bundled `twistysim.min.js` redistribution

The next clean move is not another immediate `rubix-cube-solver` widening by default.

The next queue head should be:

- a source-backed `Phase 6R-D` `roice3/MagicTile` preparation/control pass

Keep the future legal sequencing guard visible when this row widens again:

- do not copy or redistribute `frontend/lib/twistysim.min.js` without preserving or replacing its
  upstream provenance/license
