feat: implement linting and testing

.github/workflows/ci.yml

@@ -0,0 +1,84 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+jobs:
+  # ── Lint ────────────────────────────────────────────────────────────────
+  lint-python:
+    name: Ruff (lint + format)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Install dependencies
+        run: uv sync
+
+      - name: Ruff lint
+        run: uv run ruff check .
+
+      - name: Ruff format check
+        run: uv run ruff format --check .
+
+  lint-sql:
+    name: SQLFluff
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Install dependencies
+        run: uv sync
+
+      - name: SQLFluff lint
+        run: uv run sqlfluff lint dbt/models --dialect postgres
+
+  lint-yaml-json-md:
+    name: Prettier (YAML / JSON / Markdown)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version: "20"
+
+      - name: Install prettier
+        run: npm install --global prettier
+
+      - name: Prettier check
+        run: |
+          prettier --check \
+            "**/*.yml" "**/*.yaml" "**/*.json" "**/*.md" \
+            --ignore-path .prettierignore
+
+  # ── Tests ────────────────────────────────────────────────────────────────
+  test:
+    name: Pytest
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v5
+        with:
+          enable-cache: true
+
+      - name: Install dependencies
+        run: uv sync
+
+      - name: Run tests
+        run: uv run pytest