BTGame pane + shell de-hardcode for multi-game pods (BT port phase 3)

BTGame mirrors RPGame - same GameStateData/state-machine/NetworkScan engine
driving each pod's MungaGame (take ownership, stream egg on WaitingForEgg,
Run/Abort/Stop, countdown) - with the BT differences: ApplicationID.BTL4, a
pilots grid carrying Mech/Camo/Patch/Badge/Experience, an Advanced Damage
checkbox in place of RP's Score Compression, and the Mech* in-match messages
recorded via BTMissionRecorder into BTMissionResults (.btm, gzip +
BinaryFormatter like .rpm; scores are 1000-based like RP). Free For All and
No Return share the pane; the mode selects the pilots' role. BTDefaults
persists per-mode operator defaults to BTDefaults.btd (no dialog yet).
RPGame's dead decompile members (sStopToIdleStates, IsAllPodsAppState) were
not carried over.

TeslaConsoleForm no longer assumes RP: the "AppID != 0 -> Pod Not Running RP"
check becomes a GameTag map (RPL4 -> RP, BTL4 -> BT, otherwise Unknown Pod
Application) feeding the per-game status strings, and the Games menu gains
BattleTech: Free For All / No Return.

Deferred to phase 4: mech/arena art, BT defaults dialog, BT score-sheet
print document, Apps.xml BT411 product, live-pod verification.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Console/TeslaConsole.BattleTech/BTScoreUpdateEvent.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Collections.Generic;
+
+namespace TeslaConsole.BattleTech;
+
+/// <summary>A pilot's running score changed (<c>MechScoreUpdateMessage</c>).</summary>
+[Serializable]
+internal class BTScoreUpdateEvent : BTMissionEvent
+{
+	public readonly int Score;
+
+	public override IEnumerable<BTPlayer> InvolvedPilots => new BTPlayer[1] { ReportingPilot };
+
+	public BTScoreUpdateEvent(BTPlayer reportingPilot, TimeSpan missionTime, int score)
+		: base(reportingPilot, missionTime)
+	{
+		Score = score;
+	}
+
+	private BTScoreUpdateEvent()
+	{
+	}
+}