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>

build.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# Build script for creating binaries
+
+set -e
+
+echo "Building led-tool binaries..."
+echo "================================"
+
+# Check if we're in a pipenv environment or use pipenv run
+if command -v pipenv &> /dev/null; then
+    echo "Using pipenv..."
+    pipenv install --dev
+    PYINSTALLER_CMD="pipenv run pyinstaller"
+else
+    # Check if pyinstaller is available directly
+    if ! command -v pyinstaller &> /dev/null; then
+        echo "Installing PyInstaller..."
+        pip install pyinstaller
+    fi
+    PYINSTALLER_CMD="pyinstaller"
+fi
+
+# Build CLI binary using the spec file
+echo ""
+echo "Building CLI binary..."
+$PYINSTALLER_CMD --clean led-cli.spec
+
+echo ""
+echo "================================"
+echo "Build complete!"
+echo "Binary location: dist/led-cli"
+echo ""
+echo "To test: ./dist/led-cli -h"
+echo ""
+echo "You can distribute the binary from the dist/ directory"
+echo "without requiring Python to be installed on the target system."
+