[AZ-219] Scaffold onboard runtime project

Add the initial source, test, infrastructure, CI, configuration, and evidence-path scaffold so dependent implementation tasks have stable package and runtime boundaries.

Co-authored-by: Cursor <cursoragent@cursor.com>

.github/workflows/ci.yml

@@ -0,0 +1,43 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches:
+      - dev
+
+jobs:
+  python-quality:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+      - name: Install
+        run: |
+          python -m pip install --upgrade pip
+          python -m pip install -e ".[dev]"
+      - name: Format check
+        run: python -m black --check src tests
+      - name: Lint
+        run: python -m ruff check src tests
+      - name: Unit tests
+        run: python -m pytest tests/unit
+
+  replay-compose-smoke:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Validate compose files
+        run: |
+          docker compose -f docker-compose.yml config
+          docker compose -f docker-compose.test.yml config
+      - name: Collect artifact placeholders
+        run: mkdir -p data/test-results e2e/reports
+      - uses: actions/upload-artifact@v4
+        with:
+          name: replay-evidence-placeholders
+          path: |
+            data/test-results
+            e2e/reports