render parity unit I: 40250 PythonGraphic SetGamma, cooldown fan, up/down buttons

SetGamma, RenderCoolTimeBox, RenderUp/DownButton and GetAvailableMemory are
transliterated from 40250 in place of stubs. The cooldown fan is emitted as
untextured polygon UI commands (native_render + python_ui_surface.gd draw
Bar+quad as a polygon); D3D8 shim gains SetGammaRamp/D3DGAMMARAMP.

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

project/python_ui_surface.gd

@@ -374,6 +374,17 @@ func _draw() -> void:
 			RenderingServer.canvas_item_add_polygon(target_segments[seg_idx], poly_pts,
 					_get_color_array(argb), poly_uv, tex_rid)
 
+		elif kind == &"bar" and command.has(&"quad"):
+			# An untextured polygon piece (CPythonGraphic::RenderCoolTimeBox's fan triangles).
+			if x2 > cx1 and x1 < cx2 and y2 > cy1 and y1 < cy2:
+				if not fg_plain:
+					fg_used = _segment(fg_used, RID())
+					fg_plain = true
+				var seg_idx := fg_used - 1
+				var quad: PackedVector2Array = command[&"quad"]
+				RenderingServer.canvas_item_add_polygon(target_segments[seg_idx],
+						PackedVector2Array([quad[0], quad[1], quad[2]]), _get_color_array(argb))
+
 		elif kind == &"bar":
 			var bx1 := maxf(x1, cx1)
 			var by1 := maxf(y1, cy1)