# HyperTwist Phase S5-C Implementation Packet

Date: `2026-05-31`

Packet: `Phase S5-C`

Title: `first-party plan synthesis and orchestration glue`

## Outcome

Implemented now.

## Landed scope

- live `skill/synthesize-plan`
- live `skill/chain-bounded-workflow`
- bounded first-party plan/orchestration state over authoritative
  implementation/delegation, workflow-memory, workflow/review, and packet
  source surfaces
- registry, control-state, audit-ledger, authoring-harness, sample-contract,
  and JSON round-trip support

## Preserved boundaries

- plan/orchestration glue remains provenance-visible and bounded
- implementation/delegation, workflow-memory, and workflow/review remain
  separate prerequisite seams
- no `S6-A` provider-neutral profile/routing widening in this packet
- no `S6-B` usage/operations audit widening in this packet
- no domain or creative skill-pack widening in this packet

## Validation

- build target: `UnrealHyperTwistEditor Win64 Development`
- focused `S5-C` automation covers plan/orchestration coverage, bounded
  orchestration safety, and serialization round-trip
- `S5-B` regression and `Phase S1` skill substrate regression were updated to
  include the new family
- Unreal build/editor automation remains deferred in the current VPS-only lane
  because `UnrealEditor` is not installed on this host
