SECURITY: Implement hidden information filtering to prevent cheating.
- Create VisibleGameState, VisiblePlayerState, VisibleZone models
- get_visible_state(game, player_id): filtered view for a player
- get_spectator_state(game): filtered view for spectators
Hidden Information (NEVER exposed):
- Opponent's hand contents (count only)
- All deck contents and order
- All prize card contents
- Energy deck order
Public Information (always visible):
- Active and benched Pokemon (full details)
- Discard piles (full contents)
- Energy zone (available energy)
- Scores, turn info, phase
- Stadium in play
- 44 security-critical tests verifying no information leakage
- Tests check JSON serialization for hidden card ID leaks
- Also adds test for configurable burn damage
Completes HIGH-008 and TEST-012 from PROJECT_PLAN.json
Updates security checklist: 4/5 items now verified
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