[GPU] ship-capture: also dump VS float constants (the placement matrix)

The captured vertex BUFFER holds LOCAL positions (byte-identical to the .xpr) —
capital-ship parts are placed entirely in the vertex shader, not in the buffer.
So the per-part world/WVP matrix lives in the VS float constants. Extend the F10
capture to dump the first 48 vec4 from the SQ_VS_CONST base per draw; diffing two
parts isolates the world matrix (the camera VP block is shared across draws).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/xenia/gpu/command_processor.cc

@@ -227,6 +227,29 @@ void CommandProcessor::CaptureShipDrawForRE(
                            be_f32(p + 8));
   }
   cap_out << "\n";
+
+  // Vertex-shader float constants: the buffer holds LOCAL positions, so the
+  // per-part world (or world-view-projection) matrix that places the part lives
+  // here as a run of float4 constants. Diffing two parts' constants isolates the
+  // matrix (the camera VP block is shared). Dump the first 48 vec4 from the VS
+  // constant base as host-float (the register file stores them host-endian).
+  auto vsc = register_file_->Get<reg::SQ_VS_CONST>();
+  uint32_t cbase = vsc.base;  // starting float4 index
+  cap_out << fmt::format("  vsconst base={}:", cbase);
+  for (uint32_t i = 0; i < 48; ++i) {
+    uint32_t idx = cbase + i;
+    if (idx >= 256) {
+      break;
+    }
+    uint32_t r = XE_GPU_REG_SHADER_CONSTANT_000_X + 4 * idx;
+    float cx = register_file_->Get<float>(r);
+    float cy = register_file_->Get<float>(r + 1);
+    float cz = register_file_->Get<float>(r + 2);
+    float cw = register_file_->Get<float>(r + 3);
+    cap_out << fmt::format(" c{}=({:.4f},{:.4f},{:.4f},{:.4f})", i, cx, cy, cz,
+                           cw);
+  }
+  cap_out << "\n";
   cap_out.flush();
 }