chore: set up pre-commit framework with general hooks

Add .pre-commit-config.yaml with pre-commit-hooks v5.0.0 (trailing
whitespace, end-of-file fixer, yaml/json checks, large file guard,
merge conflict detection). Add minimal pyproject.toml. Auto-fix
trailing whitespace and missing end-of-file newlines across the
codebase.

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

python/commands/board/__init__.py

@@ -20,57 +20,57 @@ class BoardCommands:
     def __init__(self, board: Optional[pcbnew.BOARD] = None):
         """Initialize with optional board instance"""
         self.board = board
-        
+
         # Initialize specialized command classes
         self.size_commands = BoardSizeCommands(board)
         self.layer_commands = BoardLayerCommands(board)
         self.outline_commands = BoardOutlineCommands(board)
         self.view_commands = BoardViewCommands(board)
-    
+
     # Delegate board size commands
     def set_board_size(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Set the size of the PCB board"""
         self.size_commands.board = self.board
         return self.size_commands.set_board_size(params)
-    
+
     # Delegate layer commands
     def add_layer(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Add a new layer to the PCB"""
         self.layer_commands.board = self.board
         return self.layer_commands.add_layer(params)
-    
+
     def set_active_layer(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Set the active layer for PCB operations"""
         self.layer_commands.board = self.board
         return self.layer_commands.set_active_layer(params)
-    
+
     def get_layer_list(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Get a list of all layers in the PCB"""
         self.layer_commands.board = self.board
         return self.layer_commands.get_layer_list(params)
-    
+
     # Delegate board outline commands
     def add_board_outline(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Add a board outline to the PCB"""
         self.outline_commands.board = self.board
         return self.outline_commands.add_board_outline(params)
-    
+
     def add_mounting_hole(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Add a mounting hole to the PCB"""
         self.outline_commands.board = self.board
         return self.outline_commands.add_mounting_hole(params)
-    
+
     def add_text(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Add text annotation to the PCB"""
         self.outline_commands.board = self.board
         return self.outline_commands.add_text(params)
-    
+
     # Delegate view commands
     def get_board_info(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Get information about the current board"""
         self.view_commands.board = self.board
         return self.view_commands.get_board_info(params)
-    
+
     def get_board_2d_view(self, params: Dict[str, Any]) -> Dict[str, Any]:
         """Get a 2D image of the PCB"""
         self.view_commands.board = self.board