feat(Grid): flexible at() method arguments

- Support tuple argument: grid.at((x, y))
- Support keyword arguments: grid.at(x=5, y=3)
- Support pos keyword: grid.at(pos=(2, 8))
- Maintain backward compatibility with grid.at(x, y)
- Add comprehensive error handling for invalid arguments

Improves API ergonomics and Python-like flexibility

🤖 Generated with [Claude Code](https://claude.ai/code)

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

example_automation.py

@@ -0,0 +1,63 @@
+#!/usr/bin/env python3
+"""
+Example automation script using --exec flag
+Usage: ./mcrogueface game.py --exec example_automation.py
+"""
+import mcrfpy
+from mcrfpy import automation
+
+class GameAutomation:
+    def __init__(self):
+        self.frame_count = 0
+        self.test_phase = 0
+        print("Automation: Initialized")
+        
+    def periodic_test(self):
+        """Called every second to perform automation tasks"""
+        self.frame_count = mcrfpy.getFrame()
+        
+        print(f"Automation: Running test at frame {self.frame_count}")
+        
+        # Take periodic screenshots
+        if self.test_phase % 5 == 0:
+            filename = f"automation_screenshot_{self.test_phase}.png"
+            automation.screenshot(filename)
+            print(f"Automation: Saved {filename}")
+        
+        # Simulate user input based on current scene
+        scene = mcrfpy.currentScene()
+        print(f"Automation: Current scene is '{scene}'")
+        
+        if scene == "main_menu" and self.test_phase < 5:
+            # Click start button
+            automation.click(512, 400)
+            print("Automation: Clicked start button")
+        elif scene == "game":
+            # Perform game actions
+            if self.test_phase % 3 == 0:
+                automation.hotkey("i")  # Toggle inventory
+                print("Automation: Toggled inventory")
+            else:
+                # Random movement
+                import random
+                key = random.choice(["w", "a", "s", "d"])
+                automation.keyDown(key)
+                automation.keyUp(key)
+                print(f"Automation: Pressed '{key}' key")
+        
+        self.test_phase += 1
+        
+        # Stop after 20 tests
+        if self.test_phase >= 20:
+            print("Automation: Test suite complete")
+            mcrfpy.delTimer("automation_test")
+            # Could also call mcrfpy.quit() to exit the game
+
+# Create automation instance
+automation_instance = GameAutomation()
+
+# Register periodic timer
+mcrfpy.setTimer("automation_test", automation_instance.periodic_test, 1000)
+
+print("Automation: Script loaded - tests will run every second")
+print("Automation: The game and automation share the same Python environment")