port(m1): wave 7k — M1 COMPLETE: 0 compile errors, headless engine builds (12->0)

Final three clusters:
- RoomParamKey: copy Wizard.RoomMatch/RoomParamKey.cs verbatim (UriNames/WatchUriNames
  static dicts keyed by PlayerController.ROOM_URI + PlayerControllerForWatching.
  SEND_PARAMETER — both now real enums).
- CardChooseTask: copy the TwoPick/CardChooseTask.cs (TaskManager `using`s .Arena.TwoPick,
  not .Competition — copy_loop had only landed the Competition twin).
- SetCardNumLabel CS1739: decompiler param-name artifact — the local fn's 3rd param was
  recovered as `flag` but call sites pass it named `isRed:`. First DP5 tracked patch:
  Engine/UICardList.cs edited (flag->isRed, zero logic change), recorded in
  Patches/ + manifest patched=1 (drift-clean).

M1 exit criteria met: `dotnet build SVSim.BattleEngine` = 0 errors, no Unity ref in csproj,
check_drift clean. Session 7: 198 -> 0 across waves 7a-7k.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

SVSim.BattleEngine/Shim/View/SettingsUiStubs.cs

@@ -100,7 +100,7 @@ namespace Wizard.Story.ChapterSelection.SelectionProcessing.BattleResult
 
 namespace Wizard.RoomMatch
 {
-    public partial class PlayerControllerForWatching { }
+    public partial class PlayerControllerForWatching { }  // SEND_PARAMETER enum is in Generated/PlayerControllerForWatching.g.cs
     public partial class RoomRuleSetting { }
 }