P0: project setup (packaging, CI, licences, data/oracle scripts)

- pyproject (uv/hatch, ruff, mypy strict, pytest markers), MIT LICENSE,
  THIRD_PARTY_NOTICES with verbatim BSD-2 (BeadArrayFiles) and MIT (gtc2vcf)
- CI workflow for Gitea/GitHub Actions: lint, type check, unit tests
- fetch_data.sh p0 now fetches the GSA v4 PGx demo IDATs (the GDA "Demo 36"
  bundle is a GenomeStudio project), unpacks archives, fixes pipefail bug
- make_oracle_gtcs.sh builds bcftools + gtc2vcf and writes oracle GTCs
- plan §17: corrected P0 dataset table

.github/workflows/ci.yml

@@ -0,0 +1,25 @@
+# Runs on Gitea Actions (reads .github/workflows) and GitHub Actions.
+name: ci
+on:
+  push:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python: ["3.12", "3.13"]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: astral-sh/setup-uv@v5
+        with:
+          python-version: ${{ matrix.python }}
+      - name: Install
+        run: uv venv && uv pip install -e ".[dev]"
+      - name: Lint
+        run: uv run ruff check src tests && uv run ruff format --check src tests
+      - name: Type check
+        run: uv run mypy
+      - name: Unit tests (no downloaded data needed)
+        run: uv run pytest tests/unit -q