Add LED tool: device, CLI, web UI, build scripts, and tests

- device.py: device communication/handling
- cli.py: CLI interface updates
- web.py: web interface
- build.py, build.sh, install.sh: build and install scripts
- Pipfile: Python dependencies
- lib/mpremote: mpremote library
- test_*.py: import and LED tests
- Updated .gitignore and README

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

README.md

@@ -1,2 +1,8 @@
 # led-tool
+- `-s, --show`: Display current settings from device
+- `--no-download`: Don't download settings first (use empty settings)
+**Default behavior:** Downloads settings and prints them. If any edit flags are provided, settings are modified and uploaded automatically (unless `--no-upload` is specified).
 
+## Device Connection
+
+The tools use an integrated mpremote transport to communicate with MicroPython devices. Make sure your device is connected and accessible via the specified serial port.## LicenseSee LICENSE file for details.