Import led-driver app: pico/ and esp32/ layout

Co-authored-by: Cursor <cursoragent@cursor.com>

README.md

@@ -1,2 +1,30 @@
 # led-bar
 
+## Recovery: when the board is stuck and you have to nuke the flash
+
+**Option A – clear startup files (no reflash)**  
+If the board runs but REPL/Thonny is blocked by `main.py` or `boot.py`, remove them so the next boot drops straight to REPL. From your PC (with the Pico connected via USB):
+
+```bash
+# Remove startup files (paths are on the device; try without colons if one form fails)
+mpremote fs rm boot.py
+mpremote fs rm main.py
+mpremote reset
+```
+
+If that fails, try one of these:
+
+```bash
+mpremote rm boot.py
+mpremote rm main.py
+```
+
+Or in **Thonny**: Stop the running program (Ctrl+C or Stop button), then **View → Files**, right‑click the device, delete `boot.py` and `main.py` on the device, then **Tools → Reset**.
+
+If the board doesn’t respond to serial at all, use Option B.
+
+**Option B – full flash erase (Pico 2)**  
+1. Unplug the Pico 2.  
+2. Hold **BOOTSEL**, plug USB in, then release BOOTSEL.  
+3. It should mount as a drive. Delete any existing UF2 if you want a clean state.  
+4. Copy the MicroPython UF2 for Pico 2 (RP2350) onto the drive. The board will reboot with a fresh install and empty filesystem.