[HLSL] Correct ShaderOp SRV resource states

[JoeCitizen]

Summary

• create ShaderOp SRV buffers without the unordered-access resource flag
• add PIXEL_SHADER_RESOURCE to their transition state
• initialize resources on a DIRECT command list, so that state is legal

Why

The framework follow-up @tex3d asked for when approving #8366, tracked by #8378:

We'll probably want to avoid setting the UAV flag from Res.Desc.Flags in addSRVBuffer, and OR in the D3D12_RESOURCE_STATE_PIXEL_SHADER_RESOURCE flag to Res.TransitionTo, but since that one requires a ShaderOpTest.cpp infrastructure update, we can punt these to a follow-up.

addSRVBuffer creates read-only buffers, so the UAV flag over-declares them and costs the debug layer its ability to catch a genuine SRV/UAV mismatch. The helper has no knowledge of the consuming stage, so it should advertise the full shader-resource read state.

That widening is what pulls in the infrastructure change: PIXEL_SHADER_RESOURCE is not legal on a COMPUTE list, and CreateResources was the only one of four CreateForDevice call sites not deriving its list type from the ShaderOp. Test dispatch and draw are unaffected.

Validation

Local Release ExecHLSLTests on WARP, version-matched D3D12Core and d3d12SDKLayers, ExperimentalShaders=*, debug layer enabled. Differential against unmodified main on identical binaries and runtime, compared per test rather than by totals:

Selection	This PR	main
LinAlg::DxilConf_SM610_LinAlg::*	22 total, 17 passed, 4 failed, 1 skipped	identical
*BasicTriangleOpTest*	2 total, 2 passed	identical

No individual result differs. The four failures and one skip are pre-existing runtime gaps that reproduce unchanged on main. BasicTriangleOpTest exercises the DIRECT-list change on a graphics ShaderOp. No debug layer errors were emitted, and no physical GPU or HLK lab execution is claimed.

Refs #7841
Refs #8378
Closes #8684

Assisted-by: GitHub Copilot

[JoeCitizen]

Closing for now to avoid running CI on a long series of draft PRs while #8666 is under review. The branch linalg-hlk-srv-buffer-flags is retained and unchanged; this will be reopened once the base of the stack has landed.