Record the exact sync2 COPY/TRANSFER_WRITE to HOST/HOST_READ buffer dependency over the copied readback range before ending and submitting the existing command buffer. Preserve coherent mapping and queue-idle completion.
Add a portable guard that inspects the descriptor factory used by the live ReadBack path and pins copy, descriptor, barrier, end, and submit order without initializing Vulkan.
Mutations performed and restored:
1. Removed the live post-copy barrier: the guard first failed with Expected copy -> descriptor -> barrier -> end -> submit, got 4260, -1, -1, -1, 4386, 4900.
2. Changed source access to TransferReadBit: the guard first failed Assert.Equal, expected Access2TransferWriteBit, actual Access2TransferReadBit.
3. Moved the correct barrier before the copy: the guard first failed with Expected copy -> descriptor -> barrier -> end -> submit, got 4657, 4260, 4525, 4594, 4783, 5297.
Tag the production offscreen witness as Lane=Vulkan, exclude capability-owned tests from the portable Release filter, and give lavapipe an explicit trait-only invocation after the portable Vulkan contracts.
Document the lane and pin witness, portable-filter, and workflow ownership without initializing Vulkan.
Mutations performed and restored:
1. Removed the witness trait: VulkanLaneOwnershipContractTests first failed Assert.Matches because the Lane=Vulkan/Fact/method pattern was absent.
2. Removed Lane!=Vulkan from the default filter: the contract first failed Assert.Contains, not found Lane!=Vulkan.
3. Weakened the dedicated invocation to Lane!=Vulkan: the contract first failed Assert.Contains, not found --filter Lane=Vulkan in the hardware step.
4. Narrowed the dedicated invocation with FullyQualifiedName: the contract first failed Assert.DoesNotContain because FullyQualifiedName was present at position 231.
Use the shared absolute base-instance domain only for mesh transforms and subtract the published transform prefix for every live ordinary sidecar. Regenerate the production module and pin its hash.
Add real ordered-recording, committed-SPIR-V structure, and headless production-Vulkan pixel witnesses at nonzero prefixes, including receiver active/inactive invariance.
Mutations performed and restored:
1. Transform lookup -> local instanceIndex: MeshModernSharedIndexSpirvTests first failed Assert.Contains, item 368 not found in [27,377,27] (and the pixel witness found 0 dark pixels).
2. Selection sidecar -> absolute transformIndex: MeshModernSharedIndexOffscreenTests first failed: Expected a dark local-sidecar instance, found 0 matching pixels.
3. Published TextureIndexB -> 0: SharedTransformPrefix recording first failed Assert.Equal, expected 3, actual 0.
4. Receiver choice inverted: inactive first failed because expected mesh_modern was absent and only mesh_atmospheric was recorded; active failed conversely.
5. Offscreen shader directory -> copied test output: witness first failed the exact-path Assert.Equal (expected repo src/AcDream.App/Rendering/Shaders/spv, actual tests/AcDream.App.Tests/bin/Release/net10.0/Rendering/Shaders/spv).
