fix: remove hardcoded /Users/apayne path from game engines (closes #836)

Replace hardcoded WORLD_DIR with environment-variable-configurable path.
Default: ~/.timmy/evennia/timmy_world (uses Path.home(), works on any user)
Override: TIMMY_WORLD_DIR=/custom/path python3 game.py

Files changed:
- evennia/timmy_world/game.py
- evennia/timmy_world/world/game.py

evennia/timmy_world/game.py

@@ -8,7 +8,7 @@ import json, time, os, random
 from datetime import datetime
 from pathlib import Path
 
-WORLD_DIR = Path('/Users/apayne/.timmy/evennia/timmy_world')
+WORLD_DIR = Path(os.environ.get('TIMMY_WORLD_DIR', Path.home() / '.timmy' / 'evennia' / 'timmy_world'))
 STATE_FILE = WORLD_DIR / 'game_state.json'
 TIMMY_LOG = WORLD_DIR / 'timmy_log.md'
 

evennia/timmy_world/world/game.py

@@ -8,7 +8,7 @@ import json, time, os, random
 from datetime import datetime
 from pathlib import Path
 
-WORLD_DIR = Path('/Users/apayne/.timmy/evennia/timmy_world')
+WORLD_DIR = Path(os.environ.get('TIMMY_WORLD_DIR', Path.home() / '.timmy' / 'evennia' / 'timmy_world'))
 STATE_FILE = WORLD_DIR / 'game_state.json'
 TIMMY_LOG = WORLD_DIR / 'timmy_log.md'