refactor: remove the packet macros, WriteHeader and PacketUtils

Nothing in the server writes or reads a packet by hand any more, so the
helpers for doing so go:
- CBITSTREAM, CMSGHEADER, CINSTREAM, CINSTREAM_SKIP_HEADER, SEND_PACKET,
  SEND_PACKET_BROADCAST and HEADER_SIZE leave dCommonVars.h;
- the free BitStreamUtils::WriteHeader (LUBitStream::WriteHeader writes the
  same bytes) and the unused PacketUtils::SavePacket are deleted.
The last raw reads are replaced: WorldServer builds its input stream
directly, the master packet logs read the header with
LUBitStream::ReadHeader instead of peeking at packet->data[1] and [3], and
MessageInspector reads a sent game message's header with the new
NetGameMsg::ReadPacketHeader (the counterpart of WritePacket) instead of
memcmp/memcpy. packet->data[0] is still compared with RakNet's own
connection IDs.

The frozen oracles keep using the macros verbatim through the test-only
tests/dGameTests/LegacyPacketMacros.h; the HeaderSkip tests, which only
tested CINSTREAM_SKIP_HEADER, are removed.

docs/PacketArchitecture.md: "where we are" now describes the final state
and what still touches raw bytes (RakNet IDs, replica headers, behavior bit
streams), and a new section collects the known wire discrepancies found
during the conversion, with client addresses.

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

tests/dGameTests/dNetTests/Legacy/ChatPacketsLegacy.h

@@ -11,6 +11,7 @@
 // The byte-equality tests send the same inputs through these and through the new structs and require identical
 // bytes, so the wire format is pinned even after the production code is deleted.
 
+#include "LegacyPacketMacros.h"
 #include "BitStreamUtils.h"
 #include "dCommonVars.h"
 #include "dServer.h"

tests/dGameTests/dNetTests/Legacy/CommonAuthPacketsLegacy.h

@@ -8,6 +8,7 @@
 // The byte-equality tests run the same inputs through these and through the new structs and require
 // identical bytes, so the wire format is pinned even after the production code is deleted.
 
+#include "LegacyPacketMacros.h"
 #include "AuthPackets.h"
 #include "BitStreamUtils.h"
 #include "ClientPackets.h"

tests/dGameTests/dNetTests/Legacy/MasterPacketsLegacy.h

@@ -11,6 +11,7 @@
 // These messages never reach a client, but master, worlds, auth, chat and the dashboard can run different builds
 // during an update, so their bytes are pinned too.
 
+#include "LegacyPacketMacros.h"
 #include "BitStreamUtils.h"
 #include "dCommonVars.h"
 #include "MessageType/Master.h"

tests/dGameTests/dNetTests/Legacy/WorldPacketsLegacy.h

@@ -9,6 +9,7 @@
 // returns what was read, or the packet that was built, instead of acting on it).
 // Only the namespace changed. The byte-equality tests run the same inputs through these and the new structs.
 
+#include "LegacyPacketMacros.h"
 #include "BitStreamUtils.h"
 #include "dCommonVars.h"
 #include "dServer.h"

tests/dGameTests/dNetTests/MasterPacketsTests.cpp

@@ -48,7 +48,7 @@ namespace {
 	template<typename T>
 	void ExpectHeaderThenSerialize(const T& msg, MessageType::Master id) {
 		RakNet::BitStream old;
-		BitStreamUtils::WriteHeader(old, ServiceType::MASTER, id);
+		LUBitStream(ServiceType::MASTER, id).WriteHeader(old);
 		msg.Serialize(old);
 		EXPECT_PACKET_EQ(FromBitStream(old), StructPacket(msg));
 		RoundTrip(msg);