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_cli.py

@@ -0,0 +1,61 @@
+"""Tests for CLI option parsing."""
+
+from __future__ import annotations
+
+from click.testing import CliRunner
+
+from drill.cli import main
+
+
+class TestRunCommand:
+    def test_backend_required_without_models(self) -> None:
+        runner = CliRunner()
+        result = runner.invoke(main, ["run", "nonexistent"])
+        assert result.exit_code != 0
+
+    def test_n_default_is_1(self) -> None:
+        runner = CliRunner()
+        result = runner.invoke(main, ["run", "nonexistent", "--backend", "claude", "--n", "1"])
+        assert "Scenario not found" in result.output or result.exit_code != 0
+
+    def test_models_flag_accepted(self) -> None:
+        runner = CliRunner()
+        result = runner.invoke(main, ["run", "nonexistent", "--models", "claude,codex"])
+        assert "Scenario not found" in result.output or result.exit_code != 0
+
+    def test_n_must_be_positive(self) -> None:
+        runner = CliRunner()
+        result = runner.invoke(main, ["run", "nonexistent", "--backend", "claude", "--n", "0"])
+        assert result.exit_code != 0
+
+
+class TestListCommand:
+    def test_lists_scenarios(self, tmp_path):
+        scenarios_dir = tmp_path / "scenarios"
+        scenarios_dir.mkdir()
+        (scenarios_dir / "test-scenario.yaml").write_text("""
+scenario: test-scenario
+description: "A test scenario"
+user_posture: naive
+setup:
+  helpers: []
+  assertions: []
+turns: []
+limits:
+  max_turns: 5
+  turn_timeout: 30
+verify:
+  criteria: []
+  observe: false
+""")
+        runner = CliRunner()
+        result = runner.invoke(main, ["list", "--scenarios-dir", str(scenarios_dir)])
+        assert result.exit_code == 0
+        assert "test-scenario" in result.output
+
+
+class TestCompareCommand:
+    def test_sweep_flag_accepted(self) -> None:
+        runner = CliRunner()
+        result = runner.invoke(main, ["compare", "nonexistent", "--sweep", "abc123"])
+        assert result.exit_code != 0  # No results dir, but flag is parsed