feat(docs): update README and AGENTS.md with RTK instructions

boards/esp32-32e-4/DisplayDriverTFT.cpp

@@ -204,8 +204,6 @@ TouchEvent DisplayDriverTFT::readTouch() {
     return evt;
 }
 
-uint16_t DisplayDriverTFT::getRawTouchZ() { return _tft.getTouchRawZ(); }
-
 void DisplayDriverTFT::transformTouch(int* x, int* y) {
     // Resistive touch panel is rotated 90° vs display - swap coordinates
     int temp = *x;

boards/esp32-32e-4/DisplayDriverTFT.h

@@ -11,7 +11,6 @@ public:
     void setBacklight(bool on) override;
     void render(const ScreenState& state) override;
     TouchEvent readTouch() override;
-    uint16_t getRawTouchZ();
     HoldState updateHold(unsigned long holdMs) override;
     void updateHint(int x, int y, bool active) override;
     int width() override { return _tft.width(); }