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.

snakes/__init__.py

@@ -12,6 +12,9 @@ SNAKE_REGISTRATIONS = {
   "PrismBattleSnake_GPT_5_6_Sol": SnakeRegistration(
     "snakes.strategies.prism", "1.5.0"
   ),
+  "ZenithBattleSnake_ClaudeOpus5_5": SnakeRegistration(
+    "snakes.strategies.zenith", "1.1.0"
+  ),
   "DummSnake": SnakeRegistration("snakes.legacy.DummSnake", "1.0.0"),
   "LogicSnake": SnakeRegistration("snakes.legacy.LogicSnake", "1.1.0"),
   "MasterSnake": SnakeRegistration("snakes.legacy.MasterSnake", "1.2.0"),
@@ -42,7 +45,6 @@ DEFAULT_SNAKE_CONFIG = {
   "tail": "default",
 }
 
-
 def build_snake(selected_snake: str):
   registration = SNAKE_REGISTRATIONS.get(selected_snake)
   if registration is None:
@@ -56,7 +58,6 @@ def get_snake_version(selected_snake: str) -> str | None:
   registration = SNAKE_REGISTRATIONS.get(selected_snake)
   return registration.version if registration is not None else None
 
-
 class SnakeBuilder:
   @classmethod
   def build(self, selected_snake: str):