ci: add PR-gate workflow for lint and tests

Existing main.yml only fires on workflow_dispatch (release path), so
unit tests never ran on PRs. Add a workflow that runs pytest on every
PR (and pushes to main) across Python 3.11 and 3.12. Lint is left as
a follow-up — src/ currently has 10 pre-existing E501 violations that
would block any gate; cleaning those up is a separate change.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: chandrasekharan-zipstack

.github/workflows/test.yml

@@ -0,0 +1,36 @@
+name: Lint and Test
+
+on:
+  pull_request:
+    branches: [main, "feat/**", "fix/**"]
+  push:
+    branches: [main]
+
+jobs:
+  lint-and-test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        python-version: ["3.11", "3.12"]
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install uv
+        uses: astral-sh/setup-uv@v6
+        with:
+          version: "0.6.14"
+          enable-cache: true
+
+      - name: Install dependencies
+        run: uv sync --dev
+
+      - name: Create test env
+        run: cp tests/sample.env tests/.env
+
+      - name: Tests (pytest)
+        run: uv run pytest tests/ -v