Build a music generation workflow using YuE2 with these steps: 1) Accept lyrics and style prompt as input 2) Generate editable melody-and-chord plan in ABC notation 3) Convert symbolic music to semantic tokens 4) Synthesize acoustic latents with flow matching 5) Decode to 48kHz stereo audio. Provide Python implementation using the staged API (plan→generate_semantic→synthesize→decode) with error handling for GPU memory constraints.