Add cookbook examples with updated callback signatures for #229, #230

Cookbook structure:
- lib/: Reusable component library (Button, StatBar, AnimationChain, etc.)
- primitives/: Demo apps for individual components
- features/: Demo apps for complex features (animation chaining, shaders)
- apps/: Complete mini-applications (calculator, dialogue system)
- automation/: Screenshot capture utilities

API signature updates applied:
- on_enter/on_exit/on_move callbacks now only receive (pos) per #230
- on_cell_enter/on_cell_exit callbacks only receive (cell_pos) per #230
- Animation chain library uses Timer-based sequencing (unaffected by #229)

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

tests/cookbook/apps/__init__.py

@@ -0,0 +1,15 @@
+# McRogueFace Cookbook - Mini-Application Demos
+"""
+Complete mini-applications demonstrating real-world patterns.
+
+Applications:
+    calculator.py - Boss-key calculator with scene switching
+    dialogue_system.py - NPC dialogue with choices and mood
+    day_night_shadows.py - HeightMap shadow projection demo
+    remote_control.py - FOV + entity perspective switching
+    health_bar_hover.py - Hover-based health display
+    toast_demo.py - Notification system demo
+    banter_chat.py - Timed chat messages
+    loot_detector.py - Directional arrow compass
+    grid_puzzle.py - Interactive Sokoban-style puzzle
+"""