feat: add setup notebook and update env example for Athena

Makefile

@@ -0,0 +1,37 @@
+# Palladium — common commands. Run `make setup` once, then `make lab`.
+
+VENV    := .venv
+PY      := $(VENV)/bin/python
+PIP     := $(VENV)/bin/pip
+
+.PHONY: setup lab app test lint format clean
+
+## One-time: create venv, install deps + palladium (editable)
+setup:
+	python3 -m venv $(VENV)
+	$(PIP) install --upgrade pip
+	$(PIP) install -r requirements.txt
+	$(PIP) install -e .
+	@echo ""
+	@echo "✅ Done. Next:  make lab   → open 00_setup.ipynb"
+
+## Launch Jupyter Lab at the repo root (open 00_setup.ipynb first)
+lab:
+	$(VENV)/bin/jupyter lab
+
+## Launch the Streamlit data-entry app
+app:
+	$(VENV)/bin/streamlit run app/main.py
+
+## Run the test suite (no Athena connection needed — HTTP is mocked)
+test:
+	$(PY) -m pytest tests/ -v
+
+lint:
+	$(VENV)/bin/ruff check .
+
+format:
+	$(VENV)/bin/ruff format .
+
+clean:
+	rm -rf .pytest_cache .ruff_cache **/__pycache__