chore: update ROADMAP.md with latest progress, detail core feature targets & mechanics

ROADMAP.md

@@ -1,30 +1,161 @@
 # Roadmap
 
-A list of ideas and features that I might implement in the future.
+A comprehensive list of features needed to complete the Pac-Man emulation, organized by priority and implementation complexity.
 
-## Debug Tooling
+## Core Game Features
+
+### Ghost AI & Behavior
+
+- [x] Core Ghost System Architecture
+  - [x] Ghost entity types (Blinky, Pinky, Inky, Clyde)
+  - [x] Ghost state management (Normal, Frightened, Eyes)
+  - [x] Ghost movement and pathfinding systems
+- [ ] Authentic Ghost AI Personalities
+  - [ ] Blinky (Red): Direct chase behavior
+  - [ ] Pinky (Pink): Target 4 tiles ahead of Pac-Man
+  - [ ] Inky (Cyan): Complex behavior based on Blinky's position
+  - [ ] Clyde (Orange): Chase when far, flee when close
+- [x] Mode Switching System
+  - [ ] Scatter/Chase pattern with proper timing
+  - [x] Frightened mode transitions
+  - [ ] Ghost house entry/exit mechanics
+- [x] Ghost House Behavior
+  - [x] Proper spawning sequence
+  - [ ] Exit timing and patterns
+  - [ ] House-specific movement rules
+
+### Fruit Bonus System
+
+- [x] Fruit Spawning Mechanics
+  - [x] Spawn at pellet counts 70 and 170
+  - [ ] Fruit display in bottom-right corner
+  - [x] Fruit collection and scoring
+  - [x] Bonus point display system
+
+### Level Progression
+
+- [ ] Multiple Levels
+  - [ ] Level completion detection
+  - [ ] Progressive difficulty scaling
+  - [ ] Ghost speed increases per level
+  - [ ] Power pellet duration decreases
+- [ ] Intermission Screens
+  - [ ] Between-level cutscenes
+  - [ ] Proper graphics and timing
+
+### Audio System Completion
+
+- [x] Core Audio Infrastructure
+  - [x] Audio event system
+  - [x] Sound effect playback
+  - [x] Audio muting controls
+- [ ] Background Music
+  - [ ] Continuous gameplay music
+  - [ ] Escalating siren based on remaining pellets
+  - [ ] Power pellet mode music
+  - [ ] Intermission music
+- [x] Sound Effects
+  - [x] Pellet eating sounds
+  - [x] Fruit collection sounds
+  - [ ] Ghost movement sounds
+  - [ ] Level completion fanfare
+
+### Game Mechanics
+
+- [ ] Bonus Lives
+  - [ ] Extra life at 10,000 points
+  - [x] Life counter display
+- [ ] High Score System
+  - [ ] High score tracking
+  - [x] High score display
+  - [ ] Score persistence
+
+## Secondary Features (Medium Priority)
+
+### Game Polish
+
+- [x] Core Input System
+  - [x] Keyboard controls
+  - [x] Direction buffering for responsive controls
+  - [x] Touch controls for mobile
+- [ ] Pause System
+  - [ ] Pause/unpause functionality
+  - [ ] Pause menu with options
+- [ ] Input System
+  - [ ] Input remapping
+  - [ ] Multiple input methods
+
+## Advanced Features (Lower Priority)
+
+### Difficulty Options
+
+- [ ] Easy/Normal/Hard modes
+- [ ] Customizable ghost speeds
+
+### Data Persistence
+
+- [ ] High Score Persistence
+  - [ ] Save high scores to file
+  - [ ] High score table display
+- [ ] Settings Storage
+  - [ ] Save user preferences
+  - [ ] Audio/visual settings
+- [ ] Statistics Tracking
+  - [ ] Game statistics
+  - [ ] Achievement system
+
+### Debug & Development Tools
 
-- [ ] Game state visualization
-- [ ] Game speed controls + pausing
-- [ ] Log tracing
 - [x] Performance details
+- [x] Core Debug Infrastructure
+  - [x] Debug mode toggle
+  - [x] Comprehensive game event logging
+  - [x] Performance profiling tools
+- [ ] Game State Visualization
+  - [ ] Ghost AI state display
+  - [ ] Pathfinding visualization
+  - [ ] Collision detection display
+- [ ] Game Speed Controls
+  - [ ] Variable game speed for testing
+  - [ ] Frame-by-frame stepping
 
-## Customization
+## Customization & Extensions
 
-- [ ] Themes & Colors
-  - Color-blind friendly options
-- [ ] Perfected ghost AI algorithms
+### Visual Customization
+
+- [x] Core Rendering System
+  - [x] Sprite-based rendering
+  - [x] Layered rendering system
+  - [x] Animation system
+  - [x] HUD rendering
+- [ ] Display Options
+  - [ ] Fullscreen support
+  - [x] Window resizing
+    - [ ] Pause while resizing (SDL2 limitation mitigation)
+  - [ ] Multiple resolution support
+
+### Gameplay Extensions
+
+- [ ] Advanced Ghost AI
   - [ ] Support for >4 ghosts
-- [ ] Custom level generation with multi-map tunneling
+  - [ ] Custom ghost behaviors
+- [ ] Level Generation
+  - [ ] Custom level creation
+  - [ ] Multi-map tunneling
+  - [ ] Level editor
 
-## Online Features
+## Online Features (Future)
 
-- [ ] Scoreboard system
-  - Axum server with database and OAuth2 auth
-  - Authentication via GitHub/Discord/Google
-  - Profile features:
-    - [ ] Optional avatars (downscaled to match 8-bit aesthetic)
-    - Custom names (3-14 chars, filtered for abuse)
-  - Zero-config client implementation
-    - Uses default API endpoint
-    - Manual override available
+### Scoreboard System
+
+- [ ] Backend Infrastructure
+  - [ ] Axum server with database
+  - [ ] OAuth2 authentication
+  - [ ] GitHub/Discord/Google auth
+- [ ] Profile Features
+  - [ ] Optional avatars (8-bit aesthetic)
+  - [ ] Custom names (3-14 chars, filtered)
+- [ ] Client Implementation
+  - [ ] Zero-config client
+  - [ ] Default API endpoint
+  - [ ] Manual override available