# HyperTwist Phase 8A embedded browser runtime hardening implementation packet

Created on `2026-06-19`

## Status

- first-party HyperTwist packet
- bounded first-party `Phase 8A` continuation slice

## Purpose

This packet hardens the already-landed embedded browser shipping lane without
widening into a browser-first topology change or any native renderer branch.

The landed slice is:

- queue outbound Unreal command payloads until the embedded browser runtime
  reports ready
- retain the latest outbound shell-state payload until runtime-ready, then
  flush that shell state before queued commands
- broadcast browser runtime-ready notifications through the first-party bridge
  object so the widget can complete a deterministic handshake
- add focused automation proving the queue, flush order, and runtime-ready
  bridge signal

It is not:

- a full-browser client implementation
- a new browser authority inversion over Unreal runtime state
- a native `MagicTile` renderer widening packet

## Current authority basis

This implementation packet stands on:

- `docs/ops/HYPERTWIST_COMPREHENSIVE_RECONSTRUCTION_ROADMAP_2026-06-10.md`
- `docs/v6_5_deep_manual_pack/HyperTwist/ROADMAP.md`
- `docs/v6_5_deep_manual_pack/HyperTwist/ARCHITECTURE.md`
- `docs/v6_5_deep_manual_pack/HyperTwist/FEATURE_REGISTRY.md`
- `docs/arch/HYPERTWIST_PHASE7C_MAGICTILE_NATIVE_BEHAVIOR_PROOF_IMPLEMENTATION_PACKET_2026-06-19.md`
- `docs/arch/HYPERTWIST_PHASE7D_MAGICTILE_RENDERER_PORT_DECISION_PACKET_2026-06-19.md`
- `docs/arch/HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md`

## Landed scope

Current code now hardens the live embedded-browser lane through:

- `UHyperTwistBrowserWidget` outbound queue ownership for:
  - pending command JSON payloads
  - latest pending shell-state JSON payload
  - runtime-ready handshake state
- first-party flush ordering that applies shell state before queued commands
  once the browser runtime is ready
- `UHyperTwistBrowserBridgeObject` runtime-ready delegate broadcast
- focused automation in `HyperTwistBrowserBridgeObjectTest.cpp` for:
  - runtime-ready delegate retention/broadcast
  - queued outbound browser messages and flush ordering

## Why this hardening mattered

The earlier browser-runtime bootstrap already queued messages once the browser
JavaScript runtime existed. The remaining deterministic gap was earlier in the
handshake: Unreal could still try to send command or shell-state payloads
before the embedded widget/runtime bridge was actually ready to receive them.

This packet closes that gap on the Unreal side while preserving the already
landed first-party browser shell and bridge topology.

## Validation

Windows build validation:

- `Build.bat UnrealHyperTwistEditor Win64 Development -Project='C:\HyperTwist_worktrees\phase10validate\UnrealHyperTwist\UnrealHyperTwist.uproject' -WaitMutex -NoHotReloadFromIDE -NoUba`
- result on `2026-06-19`: `Result: Succeeded` with UnrealBuildTool
  `Total execution time: 96.96 seconds` on isolated worktree
  `C:\HyperTwist_worktrees\phase10validate`

Focused browser validation:

- `Automation RunTests HyperTwist.Browser`
- result on `2026-06-19`: exported
  `Saved\AutomationReports\Browser-Hardening-Verify` with all `6`
  `HyperTwist.Browser.*` tests passing, including:
  - `Bridge.RuntimeReadyDelegate`
  - `Widget.QueuedOutboundMessages`

Adjacent regression validation:

- `Automation RunTests HyperTwist.FirstParty.MagicTile`
- `Automation RunTests HyperTwist.Permissive.MagicTile`
- result on `2026-06-19`: exported
  `Saved\AutomationReports\Phase7-MagicTile-BrowserHardening` with all `7`
  `HyperTwist.FirstParty.MagicTile.*` tests passing and
  `Saved\AutomationReports\Phase7-Permissive-MagicTile-BrowserHardening` with
  all `6` `HyperTwist.Permissive.MagicTile.*` tests passing

## Queue effect

This packet keeps the live embedded browser/CEF shipping lane intact, but it
raises its determinism and test coverage:

- Unreal-side browser startup is now tolerant of early outbound traffic before
  runtime-ready
- browser bridge readiness is now a first-party signal rather than a silent
  assumption
- current browser/MagicTile validation grows from earlier green proof into a
  stronger shipping-lane hardening packet without reopening renderer decisions
