Remove 22 fake/simulated modules; add 4 real tools (WiFi Scan, I2C Probe, SPI Flash ID, Logic Probes); scrollable menu; honest Auto Recon + Bench Diag

src/core/shell.h

@@ -12,6 +12,7 @@ private:
   Module* mods[MAX]; int nmods = 0;
   int sel = 0;              // menu cursor
   int active = -1;          // -1 == in menu
+  int top = 0;              // first visible menu row
   uint32_t lastTick = 0;
   void add(Module* m) { if (nmods < MAX) mods[nmods++] = m; }
   void drawMenu(bool force = false);