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/GameBoard.py

@@ -132,7 +132,7 @@ class GameBoard:
   def _get_game_url(self, local_game:bool):
     if local_game:
       return None
-    return f"https://play.battlesnake.com/game/{self.id}"
+    return f"https://arena.battlesnake.com/games/{self.id}"
 
   def _set_winner_snake_name(self, snakes:list[dict]):
     if self.my_snake["id"] in [ x["id"] for x in snakes]: