staging lint check

.github/workflows/staging-lint.yml

@@ -0,0 +1,42 @@
+name: Staging Lint
+
+on:
+  push:
+    branches: [staging]
+  pull_request:
+    branches: [staging]
+
+jobs:
+  ruff:
+    name: Ruff (format + check)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+          cache: pip
+
+      - name: Install ruff
+        run: pip install ruff
+
+      - name: Check formatting
+        run: ruff format --check .
+
+      - name: Run ruff check
+        run: ruff check .
+
+  smoke:
+    name: Smoke (syntax + imports)
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.10"
+          cache: pip
+
+      - name: Byte-compile source tree
+        run: python -m compileall -q app agent_core agents decorators skills