Simplify topology to 3 agents + 2 tools

Rename module to mealgraph; add CC BY-NC 4.0 LICENSE; slim Space metadata

Add live demo link to README

Harden Gemini structured-decoding contract and write_memory semantics

Switch to Gemini 3.x latest aliases; grounded WebSearch; lab results in UI

Bump HF Space SDK to gradio 5.50.0; drop dev deps from requirements

Shorten short_description to satisfy HF Space 60-char limit

Phase 7: Gradio demo + Hugging Face Space metadata

Initial commit: existing Nutrition MAS prototype