feat: add Prism snake and gameplay database lifecycle

- Add bitboard-accelerated Prism and versioned Supreme snake implementations.
- Add database-backed move benchmarks and focused strategy tests.
- Normalize gameplay storage while preserving replay compatibility.
- Add deterministic game quality scoring and replay retention tiers.
- Add backup-first SQLite cleanup, verification, and replacement tooling.
- Add safe compact-plus-delta database merging with conflict detection.
- Extend SQLite and PostgreSQL schemas for replay and quality metadata.
- Add PostgreSQL development service and pytest import configuration.
- Update gameplay documentation and the quart_common submodule revision.

snakes/__init__.py

@@ -10,6 +10,8 @@ SNAKE_REGISTRY = {
   "TrainedBattleSnake": "0.1.0",
   "UltimateBattleSnake": "4.5.0",
   "ApexBattleSnake": "1.0.0",
+  "SupremeBattleSnake_ClaudeOpus4_6": "1.0.0",
+  "PrismBattleSnake_GPT_5_6_Sol": "1.0.0",
 }
 
 DEFAULT_SNAKE_CONFIG = {