fix: Address 4 critical codebase issues

[braedonsaunders]

1. Add 8 missing naval abilities (abilities.ts)

   • boost, flak_barrage, submerge, depth_charge_defense
   • beach_assault, amphibious_mode, shore_bombardment, yamato_cannon
   • Prevents runtime errors when naval units try to use abilities

2. Implement multiplayer lockstep barrier (Game.ts, GameCommand.ts)

   • Add HEARTBEAT command type for tick synchronization
   • Implement hasAllCommandsForTick() barrier check
   • Add heartbeat sending for ticks without player actions
   • Add timeout handling to prevent infinite hangs
   • Ensures both players execute same commands per tick

3. Add projectileType cross-reference validation (DefinitionValidator.ts)

   • Validates unit.projectileType references exist
   • Validates transformMode.projectileType references
   • Validates building.projectileType for turrets
   • Optional parameter maintains backwards compatibility

4. Refactor debug logger to use factory function (debugLogger.ts)

   • Reduces 118 lines of boilerplate to 38 lines
   • createCategoryLogger() factory generates all loggers
   • Same public API, no breaking changes

https://claude.ai/code/session_01AxoTtAx1mKqsWq21g8h5Rf