Add Celebright holiday-lights integration

Home Assistant custom integration for Celebright (CLC-03) holiday-lights
controllers, plus a standalone reference client. Local-only, reverse-engineered
from the device's WebSocket protocol — talks directly to the controller on the
LAN with no vendor cloud.

- select entity exposes the device's saved scenes plus an off option
- firmware-v2 protocol (savedScenes); getSystemState drives availability and
  the active scene, scene library fetched best-effort and cached
- WS connect/recv/send wrapped in asyncio timeouts so a silent device can't
  blow past HA's setup deadline
- config flow prompts for the controller IP; no credentials involved
- docs/PROTOCOL.md: full v2 WebSocket protocol and device behaviors

Migrated from the private dfritz/celebright with history dropped and internal
site references removed. MIT-licensed.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F6B8b3iYNv6QUftK2FDfYb

Makefile

@@ -0,0 +1,46 @@
+.PHONY: deploy clean help setup
+
+# Configuration — override on the command line or in your environment, e.g.
+#   make deploy REMOTE_HOST=homeassistant.local
+REMOTE_HOST ?= homeassistant.local
+REMOTE_PATH ?= /homeassistant/custom_components
+REMOTE_USER ?= root
+LOCAL_PATH = custom_components/celebright
+
+# Default target
+help:
+	@echo "Celebright Home Assistant Integration - Makefile"
+	@echo ""
+	@echo "Available targets:"
+	@echo "  make deploy  - Deploy integration to Home Assistant (set REMOTE_HOST)"
+	@echo "  make setup   - Ensure remote directory exists with correct permissions"
+	@echo "  make clean   - Remove Python cache files"
+	@echo "  make help    - Show this help message"
+	@echo ""
+	@echo "Override REMOTE_HOST / REMOTE_PATH / REMOTE_USER for your own host."
+
+# Ensure remote directory exists with correct permissions
+setup:
+	@echo "Setting up remote directory on $(REMOTE_HOST)..."
+	@ssh $(REMOTE_HOST) "sudo mkdir -p $(REMOTE_PATH)/celebright && sudo chown -R $(REMOTE_USER):$(REMOTE_USER) $(REMOTE_PATH)/celebright"
+	@echo "Setup complete!"
+
+# Deploy integration to Home Assistant
+deploy: setup
+	@echo "Deploying Celebright integration to $(REMOTE_HOST)..."
+	rsync -avz --delete \
+		--exclude='__pycache__' \
+		--exclude='*.pyc' \
+		--exclude='.DS_Store' \
+		--exclude='*.swp' \
+		$(LOCAL_PATH)/ $(REMOTE_HOST):$(REMOTE_PATH)/celebright/
+	@echo ""
+	@echo "Deployment complete!"
+	@echo "Remember to restart Home Assistant to load the changes."
+
+# Clean Python cache files
+clean:
+	@echo "Cleaning Python cache files..."
+	find $(LOCAL_PATH) -type d -name '__pycache__' -exec rm -rf {} + 2>/dev/null || true
+	find $(LOCAL_PATH) -type f -name '*.pyc' -delete 2>/dev/null || true
+	@echo "Clean complete!"