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fix(demo.html): 5 distinct DrugEnv scenarios incl. 2 penalty cases

fix(demo): top-row agent buttons need real generator fns, not lambdas

fix(demo): inline heuristic helpers — no training/ dependency

demo: add 5 quick test cases + grader breakdown panel + Show JSON

fix: add top-level requirements.txt referenced by space/env/requirements.txt

space: add root Dockerfile for env Space

initial: drugenv FastAPI + gradio demo

initial commit