# HyperTwist Phase 7D MagicTile renderer-port evidence audit

Created on `2026-06-19`

## Status

- first-party HyperTwist packet
- spec-only `Phase 7D` evidence/control slice
- no implementation widening is granted by this packet

## Purpose

This packet audits the currently landed `MagicTile` embedded-browser lane
against the explicit `Phase 7D` renderer-port go/no-go criteria.

The required output is not a renderer plan. It is:

- an evidence-backed verdict on whether native renderer widening is currently
  justified
- an explicit record of which `Phase 7D` criteria are already satisfied only
  as prerequisites and which are still missing
- a stable authority note that keeps future widening closed unless real new
  evidence appears

## Current authority basis

This audit stands on:

- `docs/arch/HYPERTWIST_PHASE7D_MAGICTILE_RENDERER_PORT_DECISION_PACKET_2026-06-19.md`
- `docs/arch/HYPERTWIST_PHASE7C_MAGICTILE_NATIVE_BEHAVIOR_PROOF_IMPLEMENTATION_PACKET_2026-06-19.md`
- `docs/arch/HYPERTWIST_PHASE8B_OPTIONAL_FULL_BROWSER_CLIENT_HTTP_BACKEND_PREPARATION_PACKET_2026-06-19.md`
- `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/ops/HYPERTWIST_IMPLEMENTATION_PHASE_1_KICKOFF.md`

## Evidence reviewed

Current embedded-browser lane evidence:

- `UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistBrowser/HyperTwistBrowserWidget.h`
- `UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistBrowser/HyperTwistBrowserWidget.cpp`
- `UnrealHyperTwist/Source/UnrealHyperTwist/Public/HyperTwistBrowser/HyperTwistBrowserBridgeObject.h`
- `UnrealHyperTwist/Source/UnrealHyperTwist/Private/HyperTwistBrowser/HyperTwistBrowserBridgeObject.cpp`
- `Content/Browser/index.html`
- `Content/Browser/src/browser-runtime-bootstrap.js`
- `Content/Browser/src/browser-spatial-runtime-fallback.js`

Focused automation evidence:

- `UnrealHyperTwist/Source/UnrealHyperTwist/Tests/HyperTwistBrowserBridgeObjectTest.cpp`
- `UnrealHyperTwist/Source/UnrealHyperTwist/Tests/HyperTwistMagicTilePhase7HostBridgeContractTest.cpp`
- `UnrealHyperTwist/Source/UnrealHyperTwist/Tests/HyperTwistMagicTilePhase7CNativeBehaviorProofTest.cpp`

Previously landed validation evidence:

- Windows Unreal build succeeded on `2026-06-19` on isolated worktree
  `C:\HyperTwist_worktrees\phase10validate`
- `HyperTwist.FirstParty.MagicTile.*` regression suite passed `7/7`
- `HyperTwist.Browser.*` regression suite passed `4/4`
- `HyperTwist.Permissive.MagicTile.*` regression suite passed `6/6`

## Audit findings

The reviewed code and tests show:

- the current embedded-browser shell is a real first-party shipping lane, not
  a placeholder
- `UHyperTwistBrowserWidget` already binds the authoritative browser shell and
  pushes shell state plus tiling state envelopes across the first-party bridge
- `UHyperTwistBrowserBridgeObject` already caches and decodes typed tiling
  state envelopes through first-party training tiling helpers
- the browser shell has bundled-runtime and fallback-runtime behavior rather
  than a brittle single-path bootstrap
- the landed `Phase 7A` and `Phase 7B` tests already prove the current host
  decision, bridge contract, scramble normalization, and timer continuity
- the landed `Phase 7C` proof seam already covers the key pre-renderer
  behavior vocabulary:
  - selected-cell focus
  - candidate-twist disambiguation
  - preview token derivation
  - commit or cancel semantics
  - shared scramble normalization
  - timer continuity

No reviewed artifact demonstrated a current browser-host failure that requires
native spherical or hyperbolic renderer ownership to proceed.

## Criteria scorecard

| `Phase 7D` criterion | Current status | Audit result |
| --- | --- | --- |
| Concrete first shipping target | Missing | No active renderer request currently names one puzzle/geometry family, one projection or view contract, and one bounded renderer-facing interaction surface. |
| Real browser-host insufficiency | Missing | The landed browser shell, bridge object, bundled/fallback runtime path, and browser automation currently support the existing lane rather than proving a gap. |
| `Phase 7C` behavior vocabulary reused as authority | Present as prerequisite | The landed proof seam already owns selected-cell focus, twist disambiguation, preview, commit/cancel, scramble normalization, and timer continuity, but that alone does not justify renderer widening. |
| Bounded first-party renderer-only scope | Missing | No current slice narrows the future work to one renderer-only pilot above the landed browser host/bridge posture. |
| Explicit Windows renderer validation plan | Missing | Current Windows build and regression proof validate the existing browser/proof lane, not a renderer-facing delta. |
| Authority boundaries preserved | Present as prerequisite | Current posture stays first-party, keeps `WinForms` / `OpenTK` ownership closed, and keeps the optional full-browser client path separate from native renderer decisions. |

## Verdict

The current renderer-port decision remains hard `No-Go`.

That verdict is required by the evidence, not by preference:

- the existing embedded-browser lane is functioning as an intentional owned
  product surface
- the landed `Phase 7C` proof seam already closes the pre-renderer behavior
  gap that previously justified caution
- no concrete browser-host failure has been shown
- no bounded renderer-only target has been named
- no renderer-specific Windows build and regression plan exists yet

## What would be required to reopen later

Future native renderer widening may reopen only if a later packet adds all of
the following:

1. one explicit first shipping target:
   - one puzzle or geometry family
   - one projection or view posture
   - one bounded interaction surface above the landed `Phase 7C` seam
2. one demonstrated browser-host failure that remains after using the landed
   shell, bridge, and state-envelope vocabulary as intended
3. one renderer-only pilot scope that does not reopen host-shell or generic
   runtime-base ownership
4. one explicit Windows build plus focused renderer regression plan alongside
   reruns of `HyperTwist.FirstParty.MagicTile`, `HyperTwist.Browser`, and
   `HyperTwist.Permissive.MagicTile`

## Queue effect

If this audit lands cleanly:

- the `Phase 7D` decision packet remains the authority gate
- the current embedded-browser/CEF lane remains the active shipping posture
- the optional full-browser client branch remains a separate spec lane
- future native renderer work remains closed until a later request supplies new
  evidence rather than speculation
