Extract shared contract, drop BinaryFormatter wire, modernize to net8/x64

Make the Console<->Launcher system source-built and modern now that the console
is under our control and the WinXP-era pods are gone.

Contract extraction (Contract/Tesla.Contract.csproj):
- One multi-targeted (net48;net8.0-windows) source project for the RPC contract,
  replacing the vendored TeslaConsoleLaunchLib.dll and the hand-synced Tesla.Net
  replica in Launcher/LaunchModels_Shared.cs. Emits assembly TeslaConsoleLaunchLib.

SecureConfig extraction (SecureConfig/Tesla.SecureConfig.csproj):
- net48 source of the first-boot provisioning protocol (UDP beacons, OFB crypto,
  RSA key exchange), replacing the vendored TeslaSecureConfiguration.dll.

Remove BinaryFormatter from the wire (RCE sink + the reason net6 was pinned):
- Console<->Launcher RPC is now length-prefixed System.Text.Json frames
  (Contract/PodRpcProtocol.cs) over the unchanged OFB transport; dispatch by
  method name. Deleted the SerializationBinder / MethodInfoProxy machinery.
- Console-local BinaryFormatter (Site config, mission replays) intentionally
  retained: local net48 file I/O, not the network surface.

Runtime modernization:
- Launcher Service + Agent: net6 -> net8, win-x86 -> win-x64 (all pods are
  64-bit Win10). Kept the SHA1-default PBKDF2 (Console key-derivation compat)
  with SYSLIB0041 suppressed and documented.

Tests: differential suite now 73 green. Added SecureConfigCompatTests (OFB
ciphertext byte-identical to the vendored DLL) and PodRpcProtocolTests (JSON
round-trip of every request/response shape); removed the now-obsolete
BinaryFormatter byte-identity guard.

Build hygiene: per-project obj dirs (Launcher/Directory.Build.props) fix a
NuGet restore collision between the two Launcher projects sharing one folder.

NOT runtime-verified against a live pod.

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

Launcher/LaunchModels_Shared.cs

@@ -1,105 +1,16 @@
 // =============================================================================
-// TeslaLauncher — Shared Models
+// TeslaLauncher — Shared IPC Models
 // =============================================================================
-// Wire types (Tesla.Net): BinaryFormatter-compatible replicas of the original
-// structs from TeslaConsoleLaunchLib.dll. Field names, types, and order must
-// match exactly for serialization compatibility.
+// IPC types (Tesla.Launcher.Shared): JSON messages between the Windows Service
+// and the user-session Agent over a Named Pipe. These never touch the Console
+// TCP connection.
 //
-// IPC types (Tesla.Launcher.Shared): JSON messages between Service and Agent
-// over Named Pipe. These never touch the Console TCP connection.
+// The BinaryFormatter wire types (Tesla.Net: LaunchData, InvokeCommand, ...)
+// formerly replicated here by hand now live in the shared Tesla.Contract project
+// (assembly TeslaConsoleLaunchLib), referenced by the Service. This file is also
+// compiled into the Agent, which uses only the IPC types below.
 // =============================================================================
 
-using System;
-using System.Reflection;
-using System.Runtime.Serialization;
-
-namespace Tesla.Net
-{
-    /// <summary>RPC command from TeslaConsole. Function is a MethodBase of ILauncherService.</summary>
-    [Serializable]
-    public struct InvokeCommand
-    {
-        public MethodBase Function;
-        public object[] Parameters;
-    }
-
-    /// <summary>RPC result returned to TeslaConsole.</summary>
-    [Serializable]
-    public struct InvokeResult
-    {
-        public object Result;
-        public Exception Exception;
-        public TimeSpan CallDuration;
-    }
-
-    /// <summary>App identifier + display name pair.</summary>
-    [Serializable]
-    public struct LaunchPair
-    {
-        public Guid LaunchKey;
-        public string DisplayName;
-    }
-
-    /// <summary>Describes one launchable simulation application.</summary>
-    [Serializable]
-    public struct LaunchData
-    {
-        public LaunchPair LaunchPair;
-        public string WorkingDirectory;
-        public string ExeFile;
-        public string Arguments;
-        public bool AutoRestart;
-    }
-
-    /// <summary>Tracks a currently running simulation process.</summary>
-    [Serializable]
-    public struct LaunchedAppData
-    {
-        public int ProcessId;
-        public Guid LaunchKey;
-    }
-
-    /// <summary>Complete pod state snapshot for FullUpdate RPC.</summary>
-    [Serializable]
-    public struct FullUpdateData
-    {
-        public LaunchData[] InstalledApps;
-        public LaunchedAppData[] LaunchedApps;
-        public float VolumeLevel;
-    }
-
-    /// <summary>Progress of an out-of-band product installation.</summary>
-    [Serializable]
-    public struct OutOfBandProgress
-    {
-        public int PercentComplete;
-        public string Status;
-        public bool IsCompleted;
-    }
-
-    /// <summary>Interface for BinaryFormatter MethodBase resolution. Signatures must match the original exactly.</summary>
-    public interface ILauncherService
-    {
-        float VolumeLevel { get; set; }
-        void ClearStore();
-        DateTime Ping(DateTime now);
-        Guid InitiateInstallProduct();
-        OutOfBandProgress GetOutOfBandProgress(Guid invokeCallId);
-        int LaunchApp(Guid launchKey);
-        LaunchPair[] GetLaunchableApps();
-        void KillApp(Guid launchKey, int processId);
-        void KillAllOfType(Guid launchKey);
-        void KillAllApps();
-        void Shutdown(bool restart);
-        LaunchedAppData[] GetLaunchedApps();
-        LaunchData[] GetInstalledApps();
-        void RemoveApp(Guid index);
-        void InstallApp(LaunchData data);
-        void UninstallApp(Guid launchKey);
-        FullUpdateData FullUpdate();
-    }
-}
-
 namespace Tesla.Launcher.Shared
 {
     /// <summary>Command forwarded from the Windows Service to the Userspace Agent.</summary>