feat(matching): IBotRoster + hardcoded BotRoster fixture (8 bots, one per class)

AIBotProfile carries the cosmetic metadata the AI rank-battle start
endpoint composes into oppo_info. BotRoster.Pick is deterministic per
MatchContext so mid-flight retries get the same opponent. ai_id values
4001..4008 are placeholders per the existing ai-start.md TODO — we have
no live capture of the prod catalog.

Future improvement: migrate Roster to a bot-roster.json seed under
SVSim.Bootstrap/Data/seeds/ for editability without rebuilds.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.EmulatedEntrypoint/Program.cs

@@ -138,6 +138,8 @@ public class Program
             new ModePolicy("unlimited_rank_battle", PolicyKind.PvpFirstThenAiFallback),
         }));
         builder.Services.AddSingleton<IMatchingPairUpService, InProcessPairUp>();
+        // Phase 3: bot fixture used by RankBattleController.AiStart to compose oppo_info.
+        builder.Services.AddSingleton<IBotRoster, BotRoster>();
 
         builder.Services.AddTransient<ShadowverseTranslationMiddleware>();
         builder.Services.AddTransient<SessionidMappingMiddleware>();