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>

install.sh

@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+# Install script - installs dependencies and copies binary to ~/.local/bin
+
+set -e
+
+echo "Installing dependencies..."
+pipenv install "$@"
+
+# Build binary if it doesn't exist or if source is newer
+if [ ! -f "dist/led-cli" ] || [ "cli.py" -nt "dist/led-cli" ] || [ "device.py" -nt "dist/led-cli" ]; then
+    echo ""
+    echo "Building binary..."
+    pipenv run pyinstaller --clean led-cli.spec
+fi
+
+# Ensure ~/.local/bin exists
+mkdir -p ~/.local/bin
+
+# Copy binary to ~/.local/bin
+if [ -f "dist/led-cli" ]; then
+    echo ""
+    echo "Installing binary to ~/.local/bin/led-cli..."
+    cp dist/led-cli ~/.local/bin/led-cli
+    chmod +x ~/.local/bin/led-cli
+    echo "✓ Binary installed successfully!"
+    echo ""
+    echo "You can now run 'led-cli' from anywhere."
+    echo "Make sure ~/.local/bin is in your PATH."
+else
+    echo "Error: Binary not found at dist/led-cli" >&2
+    exit 1
+fi