# HyperTwist Phase S4-A Implementation Packet

Date: `2026-05-29`

Packet: `Phase S4-A`

Title: `first-party extraction skills`

## Outcome

Implemented now.

## Landed scope

- live `skill/extract-docs`
- live `skill/extract-design-spec`
- bounded first-party extraction state over authoritative first-party
  docs/design source surfaces
- registry, control-state, audit-ledger, authoring-harness, sample-contract,
  and JSON round-trip support

## Preserved boundaries

- extraction remains structured and provenance-visible
- no browser diagnostics widening in this packet
- no design translation widening in this packet
- the placeholder domain/creative family remains separate and non-source-grounded

## Validation

- build target: `UnrealHyperTwistEditor Win64 Development`
- focused `S4-A` automation passed for extraction coverage, bounded extraction,
  and serialization round-trip
- full `Phase S1` skill substrate regression passed after the new family landed
