Add game_complete event logging to codenames

[matsonj]

Add a game_complete controllog event at the end of each codenames game for leaderboards and analytics.

Context

ChainLex now emits a game_complete event with payload:

• game_id
• model info (teams/players)
• outcome (win/loss/tie)
• scores
• correct guesses
• wall_ms (duration)
• cost tracking

Task

Adapt this pattern for codenames with relevant fields:

• game_id
• red/blue team models (spymaster + operative)
• winning_team
• final scores
• rounds played
• assassin hit
• duration
• costs

This enables building leaderboards, head-to-head matchups, and efficiency metrics from controllog.