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/strategies/__init__.py

@@ -2,5 +2,10 @@
 
 from snakes.strategies.apex import ApexBattleSnake
 from snakes.strategies.prism import PrismBattleSnake_GPT_5_6_Sol
+from snakes.strategies.zenith import ZenithBattleSnake_ClaudeOpus5_5
 
-__all__ = ("ApexBattleSnake", "PrismBattleSnake_GPT_5_6_Sol")
+__all__ = (
+  "ApexBattleSnake",
+  "PrismBattleSnake_GPT_5_6_Sol",
+  "ZenithBattleSnake_ClaudeOpus5_5",
+)