Move RIO hardware + firmware archive to the TeslaRel410 repo

The physical RIO board docs (photos, schematics, GAL decode) and the
board firmware (dumps, disassembly, make_patch.py, RIO 4.3 + FastRIO
images, analysis, testlogs) describe hardware shared across all Tesla
cockpits with a lifecycle independent of this Windows app — a
native-game-only cabinet runs the firmware and never touches RIOjoy.
They now live in TeslaRel410/restoration/{rio-hardware,rio-firmware}
with full history preserved (git subtree).

Kept here: docs/PROTOCOL.md (this app's interface contract) and the
RioSerialMonitor bench harness (--mash/--e0test, C# on RioJoy.Core).
README + code comments now point at the TeslaRel410 archive.

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

tools/RioSerialMonitor/E0Test.cs

@@ -4,7 +4,7 @@ using RioJoy.Core.Serial;
 namespace RioSerialMonitor;
 
 /// <summary>
-/// E0-threshold firmware verification (rio-firmware `--e0thresh` images).
+/// E0-threshold firmware verification (TeslaRel410 restoration/rio-firmware `--e0thresh` images).
 ///
 /// Two phases against a DTR-reset board (counters zeroed, display F0000000):
 ///  - Phase A (gate hold): analog requests answered NAK-then-ACK — NAKing