# HyperTwist Phase 6R-K HactarCE/Hyperspeedcube notation and serialization implementation packet

Created on `2026-05-22`

## Status

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

## Purpose

This packet lands the next narrower bounded slice from the retained `HactarCE/Hyperspeedcube`
runtime-anchor row.

The landed slice is:

- first-party hyper-notation and replay-log serialization boundary

It is not:

- a whole `Hyperspeedcube` runtime transplant
- a puzzle-definition DSL packet
- a replay verification packet
- a stats-shape packet
- a donor move-input or desktop-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_K_HYPERSPEEDCUBE_NOTATION_SERIALIZATION_PREPARATION_PACKET_2026-05-22.md`

The retained owner remains:

- `HactarCE/Hyperspeedcube`

The top-level runtime-anchor owner does not change here:

- first-party HyperTwist with the retained `Hyperspeedcube` runtime anchor remains the broader
  runtime owner
- this packet keeps `HactarCE/Hyperspeedcube` bounded to the narrower `A1 / R1 / F2` hyper
  notation and replay-log serialization slice

## Landed scope

The current code now owns a retained `Hyperspeedcube` contract through:

- a dedicated first-party `UHyperTwistTrainingHyperspeedcubeLibrary`
- retained package references for:
  - notation core
  - notation spans
  - notation parser
  - versioned log serialization
  - donor app save/load adapter
- one bounded notation contract for:
  - node-list and single-node parse
  - layer-prefix parse
  - commutator, conjugate, rotation, and bracketed-transform grammar
  - canonical text round-trip and flattening
- one bounded replay-log serialization boundary for:
  - versioned log-file serialize and deserialize
  - warning-preserving migration
  - scramble metadata and twist-event string persistence
  - donor first-solve load caveat
- one bounded donor-attribution boundary
- runtime-library accessors and package-checklist export through:
  - `UHyperTwistTrainingRuntimeLibrary`
- focused automation coverage in:
  - `HyperTwistHyperspeedcubePhase6RKNotationSerializationContractTest.cpp`

## Why this is still intentionally bounded

This packet lands the retained notation and log-serialization seam, but it does not widen into
neighboring retained families or broader product ownership.

Still deferred:

- puzzle-definition DSL parsing or authoring
- replay verification widening
- stats-shape widening
- move-input/editor shell ownership
- desktop shell and host-dialog ownership

## Validation

Build validation:

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

Focused automation validation:

- `Automation RunTests HyperTwist.Permissive.Hyperspeedcube.Phase6R.K`

Regression automation validation:

- `Automation RunTests HyperTwist.Permissive.MagicCube5D.Phase6R.J`
- `Automation RunTests HyperTwist.Permissive.Magic120Cell.Phase6R.I`
- `Automation RunTests HyperTwist.Permissive.MagicTile.Phase6R.D`
- `Automation RunTests HyperTwist.Permissive.Hyperspeedcube.Phase6R.A`
- `Automation RunTests HyperTwist.CleanRoom.CubeDesk`

Expected covered tests:

- `NotationContract`
- `SerializationBoundary`
- `PackageChecklist`
- existing `MagicCube5D`, `Magic120Cell`, `MagicTile`, `Hyperspeedcube`, and `CubeDesk`
  regression suites

## Queue effect

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

`HactarCE/Hyperspeedcube` remains only partially incorporated:

- landed now:
  - puzzle catalog contract
  - notation contract
  - replay-log serialization boundary
  - direct-donor attribution boundary
- still deferred:
  - puzzle-definition DSL authoring
  - replay verification
  - stats-shape

The next clean move is:

- source-backed `Phase 6R-L` `HactarCE/Hyperspeedcube` replay verification preparation/control
  pass

Keep the future sequencing guards visible:

- keep the next widening slice on replay verification rather than reopening DSL and stats-shape in
  the same packet
- keep generic hyper-runtime ownership first-party and broader than this donor slice
