Move PlasmaNew to the TeslaRel410 repository

As a hardware replication project it belongs with the other hardware
restoration efforts: now at restoration/PlasmaNew in TeslaRel410
(imported there as 4391ddd3, including the uncommitted button-macro fix
and power-on cursor rendering). Doc references updated to point at the
new home. vPLASMA (src/VPlasma.Core) and tools/VPlasma.Wire remain here.

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

README.md

@@ -164,7 +164,7 @@ recovered grammar lives in `src/VPlasma.Core/Protocol/PlasmaProtocol.cs`.
   12×16 / 12×20. Attributes (`ESC H`, low 4 bits) — half-intensity
   draws dimmer, underline/reverse render in the cell, flashing text (and
   the flashing cursor) blink on the glass. Extracted from the U3 EPROM;
-  see [`PlasmaNew/FIRMWARE.md`](PlasmaNew/FIRMWARE.md). (Deferred, and
+  see `restoration/PlasmaNew/FIRMWARE.md` in the TeslaRel410 repo. (Deferred, and
   documented there: the 10 double-buffered pages and vector graphics.)
 - **Double-click** the glass to cycle three self-test pages (banner,
   charset, graphics pattern) through the same parser the wire feeds —