port 2V2-b: GamePhase dispatch consumes the Entergame burst

PythonNetworkStreamPhaseGame/PhaseGameActor/PhaseGameItem/Command,
NetworkActorManager and PythonChat/PythonChatModule are ported verbatim and
dispatched at runtime; the 2V0 chat stub module is removed and initChat()
runs before initnet() as in 40250. InstanceBase, PythonCharacterManager and
GameLib ActorInstance/RaceData/RaceManager compile but stay TODO until
2V2-c/d wire them.

Units not ported yet get their singletons from PythonBoot's GameSingletons
(CPythonApplication member order) and platform/pending stand-ins generated
by platform_stub.py pending; const char* stand-ins return "".

port.login_flow's fake server now sends the CInputLogin::Entergame order
(actor insert, NPC positions, PHASE_GAME, land list, time, channel, greet
notice, ping) and a TraceError observer asserts no unknown packet header.
port.login_live passes against the real server for 10 s of game phase.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

extension/src/platform/pending/UserInterface/PythonMessenger.cpp

@@ -0,0 +1,57 @@
+// Stand-in for the 40250 logic unit UserInterface/PythonMessenger.cpp, not ported yet: the members the ported units
+// reference, as platform_stub.py stubs. Delete this file in the commit that ports the unit into port/
+// (docs/PORT-PLAN.md).
+#include "UserInterface/StdAfx.h"
+#include "UserInterface/PythonMessenger.h"
+
+#include "../../PlatformStub.h"
+
+CPythonMessenger::CPythonMessenger()
+{
+	MT_PLATFORM_STUB();
+}
+
+CPythonMessenger::~CPythonMessenger()
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::OnFriendLogin(const char *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::OnFriendLogout(const char *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::SetMobile(const char *, BYTE) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::AppendGuildMember(const char *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::RemoveGuildMember(const char *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::RemoveAllGuildMember() -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::LoginGuildMember(const char *) -> void
+{
+	MT_PLATFORM_STUB();
+}
+
+auto CPythonMessenger::LogoutGuildMember(const char *) -> void
+{
+	MT_PLATFORM_STUB();
+}