particle: WIP setupParticleRendering recreation (disabled)

Faithful recreation attempt of SetupParticleRendering (0x7B3D20).
All game function CCs verified from assembly. Vertex buffer setup
works (8 verts produced), but D3D draw submission doesn't produce
visible output. Disabled pending investigation of GfxDeviceMethod
param struct layout. The function remains as timing-only pass-through.

Fixes found during work:
- max_particle_sprites global: 0xCF58F4 → 0xCF5B60
- billboard_matrix global: 0xCF5898 → 0xCF5888
- index_buffer_6/12: 0xCF58D0/D4 → 0xCF5BAC/0xCF5AF4
- BuildIndexBuffer takes renders_count not field_28
- Identity matrices must be mutable (game writes to them)

src/transform44/transform44.zig

@@ -25,7 +25,12 @@ extern fn transformImpl_SSE(u32, u32, u32, u32, u32) callconv(.c) void;
 extern fn calcColorValues_SSE(u32, u32, u32, u32, u32, u32, u32) callconv(.{ .x86_thiscall = .{} }) void;
 extern fn renderParticleSprites_SSE(u32, u32, u32) callconv(.{ .x86_thiscall = .{} }) u32;
 extern fn resetParticleCache() void;
+extern fn setupParticleRendering_SSE(u32, u32) callconv(.{ .x86_thiscall = .{} }) void;
 extern var stride_info: [8]u32; // exported from particle_sse.zig
+extern var debug_vertex_count: u32;
+extern var debug_max_sprites: u32;
+extern var debug_fmt_index: u32;
+extern var debug_data_ptr: u32;
 var stride_dumped: bool = false;
 
 /// Thiscall wrapper for the SSE implementation. Lives here (baseline SSE2 unit)
@@ -1461,6 +1466,13 @@ fn dumpStats() void {
     }
 
     // Dump particle VB stride info (once)
+    if (debug_vertex_count != 0) {
+        log.fmt("  partsetup_debug: verts={d} maxSprites={d} fmt={d} dataPtr=0x{x}\n", .{
+            debug_vertex_count, debug_max_sprites, debug_fmt_index, debug_data_ptr,
+        });
+        debug_vertex_count = 0;
+    }
+
     if (stride_info[0] != 0 and !stride_dumped) {
         stride_dumped = true;
         log.fmt("  vb_strides: pos={d} norm={d} color={d} tc={d}\n", .{