Remote: match the old remote's hardware; old remote code in LEGACY

- LEGACY/remote/teensy/: old remote sketch from
  https://mangavalk.com/Hexapod/remote.git @ 492dece (reference only).
- remote/Config.h: sticks on A0-A5, Nextion on Serial1 (0/1), as in the
  old sketch; MPU6050 moved to Wire2 (25/24) since A4/A5 are Wire's pins.
- NextionUI: controls on a vscope-global "control" page added to the
  old HMI; keeps the old t1 status texts; the old page-1 b2 button (and
  serial 'U') enter Nextion upload passthrough, following the PC's baud.
- Docs: NEXTION.md, remote README wiring, CLAUDE.md.

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

2026-current/LEGACY/remote/teensy/Nrf.h

@@ -0,0 +1,64 @@
+#include <SPI.h>
+#include "RF24.h"
+#include <RF24Network.h>
+#include "TransferDataStructure.h"
+
+// Nrf24 settings
+RF24 radio(9, 10); // CE, CSN
+RF24Network network(radio);
+
+const uint16_t this_node = 00;        // Address of our node in Octal format
+const uint16_t other_node = 01;       // Address of the other node in Octal format
+
+void NrfInit()
+{
+  SPI.begin();
+  radio.begin();
+  network.begin(/*channel*/ 90, /*node address*/ this_node);
+
+  // Set the PA Level low to prevent power supply related issues since this is a
+  // getting_started sketch, and the likelihood of close proximity of the devices. RF24_PA_MAX is default.
+  radio.setPALevel(RF24_PA_LOW);
+}
+
+bool NrfSendData(dataStruct2 data, bool debug = false)
+//dataStruct2 NrfSendData(dataStruct2 data, bool debug = false)
+{
+  //  network.update();
+
+  if (debug)
+    Serial.print("Sending...");
+
+  RF24NetworkHeader header(/*to node*/ other_node);
+  bool ok = network.write(header, &data, sizeof(data));
+
+  if (debug)
+  {
+    if (ok)
+      Serial.println("ok.");
+    else
+      Serial.println("failed.");
+  }
+
+  return ok;
+  //  return data;
+}
+
+dataStruct2 NrfGetData(dataStruct2 data, bool debug = false)
+{
+  //  network.update();
+  int timeout = millis() + 100;
+  while ( network.available() && timeout > millis() )
+  {
+    RF24NetworkHeader header;
+    network.read(header, &data, sizeof(data));
+
+    if (debug)
+    {
+      Serial.print("Received packet ");
+      Serial.println(data.servoPositions[0]);
+    }
+  }
+
+  return data;
+}