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DoMatchingInternal calls IMatchingPairUpService.TryPairAsync, then maps: - null result → 3002 RETRY (empty node_server_url, no battle_id) - IsAiFallback → 3011 AI_BATTLE_MATCHING_SUCCEEDED - IsOwner → 3007 SUCCEEDED_OWNER (cache pickup) - joiner → 3004 SUCCEEDED BuildForRankBattleAsync's InvalidOperationException (typically "no deck for format") surfaces as 3001 ILLEGAL so the client shows the matchmaking-error dialog rather than retrying. card_master_id is a placeholder (0) per the per-battle card-master split deferral. AI-fallback timing is covered by InProcessPairUp unit tests; controller tests focus on the wire mapping (3002, 3004, 3007). Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>