feat: add Zenith strategy and move latency tracing

- Register Zenith 1.1 with balanced duel verdicts and forced-outcome overrides.
- Prioritize permanent-trail space in Constrictor and health-aware hazard routes.
- Deduct executor queue delays and return fallback directions on move timeouts.
- Correlate response headers, replay timings, and sampled structured trace logs.
- Move shared metrics publication off the response path without losing local counts.
- Allow configurable tournament opponents and add a psql helper recipe.
- Preserve empty latency values through compact replay encoding and migration.
- Update Arena game links and use default assets for missing customizations.
- Cover strategy, HTTP lifecycle, tracing, replay codecs, and dashboard behavior.
- Validate with 260 passing Python tests, 4 skips, and 2 passing JavaScript tests.

server/blueprints/dashboard.py

@@ -23,7 +23,7 @@ def create_dashboard_blueprint(server:'Server') -> Blueprint:
       initial_game_id=initial_game_id,
       initial_summary=initial_summary,
       initial_games=initial_games,
-      battlesnake_url=os.getenv('BATTLESNAKE_GAMEBOARD_URL', 'https://play.battlesnake.com/game')
+      battlesnake_url=os.getenv('BATTLESNAKE_GAMEBOARD_URL', 'https://arena.battlesnake.com/games')
     )
 
   @blueprint.get('/dashboard/game/<game_id>')