chore: notebook updated

docs: mark stage 2 (IC50 regression) as completed

feat: complete IC50 regression notebook with baseline and tuned models

feat: add IC50 regression experiments (baseline, tuning, no-leakage)

docs: mark stage 0 as completed in PLAN.md

fix: replace deprecated boxplot labels parameter with tick_labels

fix: add boxplots, improve markdown explanations in EDA notebook

docs: update progress, plan and skill after EDA completion

feat: complete EDA stage (experiments + notebook)

chore: add requirements.txt and utils module

docs: skills updated

chore: gitignore updated

chore: gitignore added

init: project structure, skill, plan, task