# HyperTwist Phase S4-B Implementation Packet

Date: `2026-05-29`

Packet: `Phase S4-B`

Title: `first-party browser diagnostics skills`

## Outcome

Implemented now.

## Landed scope

- live `skill/capture-browser-trace`
- live `skill/discover-browser-api`
- bounded first-party browser diagnostics state over authoritative first-party
  browser/service source surfaces
- registry, control-state, audit-ledger, authoring-harness, sample-contract,
  and JSON round-trip support

## Preserved boundaries

- browser diagnostics remain provenance-visible and bounded
- extraction remains a separate prerequisite seam
- no design translation widening in this packet
- no broad browser-shell orchestration widening in this packet

## Validation

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