Remove redundant Grid.position alias, keep only Grid.pos, closes #308

Grid.position was a redundant alias for Grid.pos. Removed get_position/
set_position functions, getsetters entry, and setProperty/getProperty/
hasProperty branches. Updated all tests to use grid.pos.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

tests/integration/dijkstra_debug.py

@@ -144,7 +144,7 @@ ui = dijkstra_debug.children
 ui.append(grid)
 
 # Position and scale
-grid.position = (50, 50)
+grid.pos = (50, 50)
 grid.size = (400, 400)  # 10*40
 
 # Add title

tests/integration/dijkstra_interactive.py

@@ -199,7 +199,7 @@ ui.append(grid)
 
 # Scale and position grid for better visibility
 grid.size = (560, 400)  # 14*40, 10*40
-grid.position = (120, 60)
+grid.pos = (120, 60)
 
 # Add title
 title = mcrfpy.Caption(pos=(250, 10), text="Dijkstra Pathfinding Interactive")

tests/integration/dijkstra_interactive_enhanced.py

@@ -291,7 +291,7 @@ ui.append(grid)
 
 # Scale and position grid for better visibility
 grid.size = (560, 400)  # 14*40, 10*40
-grid.position = (120, 60)
+grid.pos = (120, 60)
 
 # Add title
 title = mcrfpy.Caption(pos=(250, 10), text="Enhanced Dijkstra Pathfinding")

tests/integration/dijkstra_test.py

@@ -124,7 +124,7 @@ ui = dijkstra_test.children
 ui.append(grid)
 
 # Position and scale grid
-grid.position = (50, 50)
+grid.pos = (50, 50)
 grid.size = (500, 300)
 
 # Add title

tests/integration/simple_interactive_visibility.py

@@ -35,7 +35,7 @@ entity.update_visibility()
 print("Setting up UI...")
 ui = vis_test.children
 ui.append(grid)
-grid.position = (50, 50)
+grid.pos = (50, 50)
 grid.size = (300, 300)
 
 # Test perspective