[Tzeentchnet]

Summary

• Exercise the test-only Newport resident handoff through the real same-device wgpu renderer and a native window, preserving ordered draws and resize handling.
• Compare the presenter's unpacked frame texture pixel-for-pixel with the software compositor for two distinct frames and a resized frame, including padded-row readback. Assert no CPU-plane access, raw-plane traffic, or routine composed-frame readback.
• Update the resident gate and documentation, including the follow-up guidance from ng1: expand resident DID state on the GPU #731 and coordination with the draft shared-presenter work in display: skip idle frames on the O2 and VPro with a shared screen-changed flag #698.

Scope and limitations

This builds on merged #731 and remains test-only; it does not enable production Newport GPU mode. The texture readback is an explicit test diagnostic, not part of ordinary presentation. Surface submission is exercised, but the test does not inspect final swapchain or on-screen pixels.

The threaded native-window test is available on Windows and Linux. macOS/Metal needs a separate main-thread window harness. #698 is not a prerequisite; its shared-presenter changes will need reconciliation if it lands.

Validation

On Windows with an NVIDIA RTX 5070, using an isolated worktree with a refreshed ignored lockfile:

.\scripts\test-resident-gate.ps1
cargo check --locked --offline -p iris --no-default-features
cargo check --locked --offline -p iris-gui --features iris/wgpu

The complete resident gate passed 65 tests, including the required Vulkan and D3D12 hardware runs. The main-worktree lockfile was left unchanged.