Add 14-part tutorial Python files (extracted, tested)

Tutorial scripts extracted from documentation, with fixes:
- Asset filename: kenney_roguelike.png → kenney_tinydungeon.png
- Entity keyword: pos= → grid_pos= (tile coordinates)
- Frame.size property → Frame.resize() method
- Removed sprite_color (deferred to shader support)

All 14 parts pass smoke testing (import + 2-frame run).

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/tutorials/part_02_tiles_collision/part_02_tiles_collision.py

@@ -0,0 +1,206 @@
+"""McRogueFace - Part 2: Walls, Floors, and Collision
+
+Documentation: https://mcrogueface.github.io/tutorial/part_02_tiles_collision
+Repository: https://github.com/jmccardle/McRogueFace/blob/master/docs/tutorials/part_02_tiles_collision/part_02_tiles_collision.py
+
+This code is extracted from the McRogueFace documentation and can be
+run directly with: ./mcrogueface path/to/this/file.py
+"""
+
+import mcrfpy
+
+# =============================================================================
+# Constants
+# =============================================================================
+
+# Sprite indices for CP437 tileset
+SPRITE_WALL = 35    # '#' - wall
+SPRITE_FLOOR = 46   # '.' - floor
+SPRITE_PLAYER = 64  # '@' - player
+
+# Grid dimensions
+GRID_WIDTH = 30
+GRID_HEIGHT = 20
+
+# =============================================================================
+# Map Creation
+# =============================================================================
+
+def create_map(grid: mcrfpy.Grid) -> None:
+    """Fill the grid with walls and floors.
+
+    Creates a simple room with walls around the edges and floor in the middle.
+    """
+    for y in range(GRID_HEIGHT):
+        for x in range(GRID_WIDTH):
+            cell = grid.at(x, y)
+
+            # Place walls around the edges
+            if x == 0 or x == GRID_WIDTH - 1 or y == 0 or y == GRID_HEIGHT - 1:
+                cell.tilesprite = SPRITE_WALL
+                cell.walkable = False
+            else:
+                cell.tilesprite = SPRITE_FLOOR
+                cell.walkable = True
+
+    # Add some interior walls to make it interesting
+    # Vertical wall
+    for y in range(5, 15):
+        cell = grid.at(10, y)
+        cell.tilesprite = SPRITE_WALL
+        cell.walkable = False
+
+    # Horizontal wall
+    for x in range(15, 25):
+        cell = grid.at(x, 10)
+        cell.tilesprite = SPRITE_WALL
+        cell.walkable = False
+
+    # Leave gaps for doorways
+    grid.at(10, 10).tilesprite = SPRITE_FLOOR
+    grid.at(10, 10).walkable = True
+    grid.at(20, 10).tilesprite = SPRITE_FLOOR
+    grid.at(20, 10).walkable = True
+
+# =============================================================================
+# Collision Detection
+# =============================================================================
+
+def can_move_to(grid: mcrfpy.Grid, x: int, y: int) -> bool:
+    """Check if a position is valid for movement.
+
+    Args:
+        grid: The game grid
+        x: Target X coordinate (in tiles)
+        y: Target Y coordinate (in tiles)
+
+    Returns:
+        True if the position is walkable, False otherwise
+    """
+    # Check grid bounds first
+    if x < 0 or x >= GRID_WIDTH:
+        return False
+    if y < 0 or y >= GRID_HEIGHT:
+        return False
+
+    # Check if the tile is walkable
+    cell = grid.at(x, y)
+    return cell.walkable
+
+# =============================================================================
+# Game Setup
+# =============================================================================
+
+# Create the scene
+scene = mcrfpy.Scene("game")
+
+# Load texture
+texture = mcrfpy.Texture("assets/kenney_tinydungeon.png", 16, 16)
+
+# Create the grid
+grid = mcrfpy.Grid(
+    pos=(80, 100),
+    size=(720, 480),
+    grid_size=(GRID_WIDTH, GRID_HEIGHT),
+    texture=texture
+)
+grid.zoom = 1.5
+
+# Build the map
+create_map(grid)
+
+# Create the player in the center of the left room
+player = mcrfpy.Entity(
+    grid_pos=(5, 10),
+    texture=texture,
+    sprite_index=SPRITE_PLAYER
+)
+grid.entities.append(player)
+
+# Add grid to scene
+scene.children.append(grid)
+
+# =============================================================================
+# UI Elements
+# =============================================================================
+
+title = mcrfpy.Caption(
+    pos=(80, 20),
+    text="Part 2: Walls and Collision"
+)
+title.fill_color = mcrfpy.Color(255, 255, 255)
+title.font_size = 24
+scene.children.append(title)
+
+instructions = mcrfpy.Caption(
+    pos=(80, 55),
+    text="WASD or Arrow Keys to move | Walls block movement"
+)
+instructions.fill_color = mcrfpy.Color(180, 180, 180)
+instructions.font_size = 16
+scene.children.append(instructions)
+
+pos_display = mcrfpy.Caption(
+    pos=(80, 600),
+    text=f"Position: ({int(player.x)}, {int(player.y)})"
+)
+pos_display.fill_color = mcrfpy.Color(200, 200, 100)
+pos_display.font_size = 16
+scene.children.append(pos_display)
+
+status_display = mcrfpy.Caption(
+    pos=(400, 600),
+    text="Status: Ready"
+)
+status_display.fill_color = mcrfpy.Color(100, 200, 100)
+status_display.font_size = 16
+scene.children.append(status_display)
+
+# =============================================================================
+# Input Handling
+# =============================================================================
+
+def handle_keys(key: str, action: str) -> None:
+    """Handle keyboard input with collision detection."""
+    if action != "start":
+        return
+
+    # Get current position
+    px, py = int(player.x), int(player.y)
+
+    # Calculate intended new position
+    new_x, new_y = px, py
+
+    if key == "W" or key == "Up":
+        new_y -= 1
+    elif key == "S" or key == "Down":
+        new_y += 1
+    elif key == "A" or key == "Left":
+        new_x -= 1
+    elif key == "D" or key == "Right":
+        new_x += 1
+    elif key == "Escape":
+        mcrfpy.exit()
+        return
+    else:
+        return  # Ignore other keys
+
+    # Check collision before moving
+    if can_move_to(grid, new_x, new_y):
+        player.x = new_x
+        player.y = new_y
+        pos_display.text = f"Position: ({new_x}, {new_y})"
+        status_display.text = "Status: Moved"
+        status_display.fill_color = mcrfpy.Color(100, 200, 100)
+    else:
+        status_display.text = "Status: Blocked!"
+        status_display.fill_color = mcrfpy.Color(200, 100, 100)
+
+scene.on_key = handle_keys
+
+# =============================================================================
+# Start the Game
+# =============================================================================
+
+scene.activate()
+print("Part 2 loaded! Try walking into walls.")