refactor(matching): IMatchingResolver shared by every do_matching family

SoloDefaultsToScripted was only consulted by ArenaTwoPickBattleController;
RankBattleController did its own inline pair-up + state-code mapping and
ignored the flag entirely. Result: turning on the flag globally only
short-circuited TK2 polls, while rank-battle polls still parked for the
PvpFirstThenAiFallback threshold (15s) before resolving — surfaced today
when the user set the flag and saw rank-battle still queue, then bot-
battle via the client-side AI (not the server-side Scripted lifecycle we
need to test WS traffic against).

New IMatchingResolver owns the cross-cutting decisions:
- honor scriptedOptIn (per-request) OR options.SoloDefaultsToScripted
  (process-wide) — bypass pair-up, register Scripted, return 3004
- otherwise call IMatchingPairUpService.TryPairAsync and translate the
  PairUpResult to the 3002/3004/3007/3011 vocabulary

Family controllers shed the duplicated logic:
- ArenaTwoPickBattleController: ~50 LOC → ~25; preserves ?scripted=1
  query opt-in (parsed permissively for "1"/"true") and the
  ArenaTwoPickException catch
- RankBattleController: ~30 LOC → ~12; preserves the 3001 mapping for
  InvalidOperationException (no deck for format) and card_master_id
  emission

DoMatchingContractTests is the durable enforcement: parametrized over
TK2 + rotation + unlimited rank, asserts SoloDefaultsToScripted=true
makes every family's first poll skip 3002 and return SUCCEEDED with a
battle_id + node_server_url. Adding a fourth family that forgets to
route through IMatchingResolver fails this test — that's the point.

MatchingResolverTests covers the six resolver paths in isolation with
mocks; per-test Harness locals (not fixture-level fields) because the
assembly is [Parallelizable(ParallelScope.All)] and shared mocks race.

957 tests passing (was 948; +9: 6 resolver + 3 contract parametrizations).
No regressions in the existing TK2 / rank-battle controller suites.

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

SVSim.EmulatedEntrypoint/Program.cs

@@ -138,6 +138,10 @@ public class Program
             new ModePolicy("unlimited_rank_battle", PolicyKind.PvpFirstThenAiFallback),
         }));
         builder.Services.AddSingleton<IMatchingPairUpService, InProcessPairUp>();
+        // Single resolver shared by every /do_matching family controller. Owns the scripted-
+        // flag short-circuit + the pair-up → matching_state mapping. Singleton: stateless,
+        // all deps are singletons too.
+        builder.Services.AddSingleton<IMatchingResolver, MatchingResolver>();
         // Phase 3: bot roster used by RankBattleController.AiStart to compose oppo_info.
         // Transient because BotRoster depends on the transient IGlobalsRepository.
         builder.Services.AddTransient<IBotRoster, BotRoster>();
@@ -156,7 +160,7 @@ public class Program
                 });
 
         var app = builder.Build();
-        
+
         // Update database (skipped for non-relational providers, e.g. InMemory in tests, and
         // skipped under the "Testing" environment where the test fixture has already called
         // EnsureCreated against a SQLite in-memory DB — the Postgres migrations would fail there).