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/drill/setup.py

@@ -0,0 +1,43 @@
+from __future__ import annotations
+
+import subprocess
+from pathlib import Path
+
+from setup_helpers import HELPER_REGISTRY
+from setup_helpers.base import create_base_repo
+
+
+def clone_template(template_dir: Path, workdir: Path) -> None:
+    """Clone (or build) template_dir into workdir with full git history."""
+    create_base_repo(workdir, template_dir)
+
+
+def run_helpers(helper_names: list[str], workdir: Path, fixtures_dir: Path) -> None:
+    for name in helper_names:
+        helper = HELPER_REGISTRY.get(name)
+        if helper is None:
+            raise ValueError(f"Unknown setup helper: {name}")
+        if name == "create_base_repo":
+            helper(workdir, fixtures_dir / "template-repo")  # ty: ignore[invalid-argument-type, too-many-positional-arguments, missing-argument]
+        elif name == "symlink_superpowers":
+            import os
+
+            helper(workdir, os.environ["SUPERPOWERS_ROOT"])  # ty: ignore[invalid-argument-type, too-many-positional-arguments, missing-argument]
+        else:
+            helper(workdir)  # ty: ignore[invalid-argument-type, missing-argument]
+
+
+def run_assertions(assertions: list[str], workdir: Path) -> None:
+    for assertion in assertions:
+        result = subprocess.run(
+            assertion,
+            shell=True,
+            cwd=workdir,
+            capture_output=True,
+            text=True,
+        )
+        if result.returncode != 0:
+            raise AssertionError(
+                f"Setup assertion failed: {assertion}\n"
+                f"stdout: {result.stdout}\nstderr: {result.stderr}"
+            )