Lift drill into evals/ at 013fcb8b7dbefd6d3fa4653493e5d2ec8e7f985b

rsync of obra/drill@013fcb8b7d into superpowers/evals/, excluding
.git/, .venv/, results/, .env/, __pycache__/, *.egg-info/,
.private-journal/.

The drill repo is unaffected by this commit; archival is a separate
manual step after this PR merges.

Source SHA recorded at evals/.drill-source-sha for divergence
detection.

evals/tests/test_e2e.py

@@ -0,0 +1,94 @@
+"""End-to-end smoke test using a mock 'bash' backend."""
+
+import shutil
+from pathlib import Path
+
+import pytest
+
+from drill.engine import Engine, ScenarioConfig
+
+
+@pytest.fixture
+def mock_scenario(tmp_path):
+    scenario = tmp_path / "test-scenario.yaml"
+    scenario.write_text("""
+scenario: e2e-smoke-test
+description: "Smoke test"
+user_posture: naive
+setup:
+  helpers:
+    - create_base_repo
+  assertions:
+    - "git rev-parse --is-inside-work-tree"
+turns:
+  - intent: "List files in the current directory"
+limits:
+  max_turns: 3
+  turn_timeout: 10
+verify:
+  criteria:
+    - "Agent listed the files"
+  observe: true
+""")
+    return scenario
+
+
+@pytest.fixture
+def mock_backend(tmp_path):
+    backend_dir = tmp_path / "backends"
+    backend_dir.mkdir()
+    (backend_dir / "mock.yaml").write_text("""
+name: mock
+cli: bash
+args: []
+required_env: []
+hooks:
+  pre_run: []
+  post_run: []
+shutdown: "exit"
+idle:
+  quiescence_seconds: 1
+  ready_pattern: "\\\\$"
+startup_timeout: 5
+terminal:
+  cols: 80
+  rows: 24
+session_logs:
+  pattern: ""
+""")
+    return backend_dir
+
+
+class TestE2ESmoke:
+    def test_scenario_config_loads(self, mock_scenario):
+        config = ScenarioConfig.from_yaml(mock_scenario)
+        assert config.scenario == "e2e-smoke-test"
+
+    def test_engine_setup_works(self, mock_scenario, mock_backend):
+        fixtures_dir = Path(__file__).parent.parent / "fixtures"
+        engine = Engine(
+            scenario_path=mock_scenario,
+            backend_name="mock",
+            backends_dir=mock_backend,
+            fixtures_dir=fixtures_dir,
+            results_dir=Path("/tmp/drill-test-results"),
+        )
+        workdir = Path("/tmp/drill-e2e-smoke")
+        if workdir.exists():
+            shutil.rmtree(workdir)
+        engine._setup(workdir)
+        assert (workdir / "package.json").exists()
+        assert (workdir / "src" / "index.js").exists()
+        # Verify git state
+        import subprocess
+
+        result = subprocess.run(
+            ["git", "branch", "--show-current"], cwd=workdir, capture_output=True, text=True
+        )
+        assert result.stdout.strip() == "main"
+        result = subprocess.run(
+            ["git", "log", "--oneline"], cwd=workdir, capture_output=True, text=True
+        )
+        assert "initial commit" in result.stdout
+        # Cleanup
+        shutil.rmtree(workdir, ignore_errors=True)