native render: transliterate D3D8 fixed-function pipeline (unit A)

- Texture coordinates: TEXCOORDINDEX generation (camera-space normal /
  position / reflection vector, LOCALVIEWER) and D3DTS_TEXTUREn under
  TEXTURETRANSFORMFLAGS (incl. PROJECTED) now run in native.vert; the
  RecordingDevice CPU uv baking and the sphere-map / multiplicative-shadow
  shader hacks are removed. Godot consumer uses Render3DStageTexcoords.
- Lighting: 8 D3D lights in camera space, 1/(a0+a1d+a2d^2) without clamp,
  spot cone theta/2 phi/2 with falloff, diffuse/ambient/emissive material
  sources, NORMALIZENORMALS, inverse-transpose normal matrix.
- Alpha test compares 8-bit alpha against ALPHAREF with ALPHAFUNC.
- Back-buffer Clear() is recorded in draw order and executed with
  vkCmdClearAttachments; render pass clears to 0xff000000.
- D3DVIEWPORT8 (incl. MinZ/MaxZ) is dynamic per-draw state.
- Missing vertex diffuse is opaque white; alpha blend mirrors SRC/DESTBLEND.
- CScreen::ms_clearDepth / ms_diffuseColor initialised to 40250's
  1.0f / 0xffffffff (were zero; exposed once clears were executed).
- Capture format v8; --screenshot-out FILE.bmp swapchain readback.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

audit/port-map/EterLib/GrpScreen.cpp.json

@@ -104,10 +104,18 @@
       "status": "TODO"
     },
     "CScreen::ClearDepthBuffer": {
-      "status": "TODO"
+      "status": "NEEDS_LIVE",
+      "impl": [
+        "extension/src/platform/EterLib/GrpScreen.cpp:CScreen::ClearDepthBuffer"
+      ],
+      "note": "Statement-equivalent Clear(ZBUFFER, ms_clearColor, ms_clearDepth, ms_clearStencil). The port had ms_clearDepth/ms_diffuseColor zero-initialized instead of 40250's 1.0f/0xffffffff; fixed. RecordingDevice now records back-buffer clears in draw order and the native renderer executes them (vkCmdClearAttachments over the current viewport); before, the clear was dropped. Native fake-server char select shows the model again with the clear executed; Windows screenshot parity open."
     },
     "CScreen::Clear": {
-      "status": "TODO"
+      "status": "NEEDS_LIVE",
+      "impl": [
+        "extension/src/platform/EterLib/GrpScreen.cpp:CScreen::Clear"
+      ],
+      "note": "Statement-equivalent Clear(TARGET|ZBUFFER); executed in draw order by the native renderer since the clear-entry change. Windows screenshot parity open."
     },
     "CScreen::IsLostDevice": {
       "status": "TODO"