chore: add Makefile and GitHub Actions workflow

Author: portfolio-author

.github/workflows/ci.yml

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+name: tests
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+          cache: pip
+      - name: Install dependencies
+        run: pip install pandas numpy scikit-learn xgboost pytest
+      - name: Run tests
+        run: pytest -q
+      # The leakage and metric tests run on hand-written fixtures, so the suite
+      # needs no network and no downloaded data.

Makefile

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+.PHONY: help install run tune test clean
+
+help:
+	@echo "install  install dependencies"
+	@echo "run      full pipeline: data, snapshots, CV, holdout, figures"
+	@echo "tune     as above, plus the XGBoost grid search"
+	@echo "test     run the test suite (no network)"
+
+install:
+	pip install -r requirements.txt
+
+run:
+	python -m src.pipeline
+
+tune:
+	python -m src.pipeline --tune
+
+test:
+	python -m pytest -q
+
+clean:
+	rm -rf data/processed/* models/*.joblib reports/*.md reports/figures/*.png reports/*.csv