Server-side puzzle-game flow (works in simulator)

[jasonappah]

Description
Implement or wire up server-side puzzle-game logic so that puzzles can be loaded and validated in the simulator environment.

Why

• Validate server behavior without hardware dependency
• Unblock end-to-end puzzle iteration

Scope

• Load puzzle state from existing sources
• Evaluate player moves against solution
• Expose events/messages for client consumption
• Verify complete flow in simulator

Acceptance

• Start-to-finish simulator session runs a puzzle without errors
• Correct moves progress puzzle; incorrect moves are rejected or hinted
• Logs/metrics indicate flow and errors clearly