fix: export app at module level — remove double-launch on HF Spaces

fix: lazy-import soundfile + graceful fallback when missing

feat: HF Inference API + cooldowns (v0.5)

fix: rename shared module to cedar_copper_tokens.py; update PRD

feat: Anishinaabe-Solarpunk aesthetic + Gradio 6.0 fixes

Initial release: CritterCalm — AI Voice Cloning Animal Soother

initial commit