Initial implementation of ableton-mcp MCP server

Full-featured MCP server exposing 124 tools for complete Ableton Live
control via AbletonOSC over OSC/UDP. Covers transport, tracks, clips,
clip slots, scenes, devices, view selection, and real-time listeners.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ableton_mcp/config.py

@@ -0,0 +1,6 @@
+import os
+
+ABLETON_HOST = os.getenv("ABLETON_HOST", "127.0.0.1")
+ABLETON_SEND_PORT = int(os.getenv("ABLETON_SEND_PORT", "11000"))
+ABLETON_RECEIVE_PORT = int(os.getenv("ABLETON_RECEIVE_PORT", "11001"))
+ABLETON_TIMEOUT = float(os.getenv("ABLETON_TIMEOUT", "5.0"))