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_config.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python3
+"""
+Example configuration script that sets up shared state for other scripts
+Usage: ./mcrogueface --exec example_config.py --exec example_automation.py game.py
+"""
+import mcrfpy
+
+# Create a shared configuration namespace
+class AutomationConfig:
+    # Test settings
+    test_enabled = True
+    screenshot_interval = 5  # Take screenshot every N tests
+    max_test_count = 50
+    test_delay_ms = 1000
+    
+    # Monitoring settings  
+    monitor_enabled = True
+    monitor_interval_ms = 500
+    report_delay_seconds = 30
+    
+    # Game-specific settings
+    start_button_pos = (512, 400)
+    inventory_key = "i"
+    movement_keys = ["w", "a", "s", "d"]
+    
+    # Shared state
+    test_results = []
+    performance_data = []
+    
+    @classmethod
+    def log_result(cls, test_name, success, details=""):
+        """Log a test result"""
+        cls.test_results.append({
+            "test": test_name,
+            "success": success,
+            "details": details,
+            "frame": mcrfpy.getFrame()
+        })
+        
+    @classmethod
+    def get_summary(cls):
+        """Get test summary"""
+        total = len(cls.test_results)
+        passed = sum(1 for r in cls.test_results if r["success"])
+        return f"Tests: {passed}/{total} passed"
+
+# Attach config to mcrfpy module so other scripts can access it
+mcrfpy.automation_config = AutomationConfig
+
+print("Config: Automation configuration loaded")
+print(f"Config: Test delay = {AutomationConfig.test_delay_ms}ms")
+print(f"Config: Max tests = {AutomationConfig.max_test_count}")
+print("Config: Other scripts can access config via mcrfpy.automation_config")