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/setup_helpers/triggering_executing_plans.py

@@ -0,0 +1,48 @@
+"""Setup helper for the triggering-executing-plans scenario.
+
+Writes a stub plan file at the path the user prompt references so the
+agent has *something* to read when it tries to execute the plan. Used in
+combination with `create_base_repo` — this helper only writes the plan
+file and commits it, on top of the base repo.
+
+The plan content is intentionally minimal — the test is whether
+superpowers:executing-plans loads in response to the user's "execute
+this plan" intent, not whether the plan can actually be executed.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from setup_helpers.base import _git
+
+PLAN_BODY = """\
+# 2024-01-15 Auth System Implementation Plan
+
+A short stub plan used by the triggering-executing-plans drill scenario.
+
+## Task 1: Add a no-op auth placeholder
+
+**File:** `src/auth.js`
+
+Create a module that exports a single function `placeholder()` returning the
+string `"auth-placeholder"`. Add a one-line test in `test/auth.test.js`.
+
+## Task 2: Wire the placeholder into the entry point
+
+**File:** `src/index.js`
+
+Import `placeholder` from `./auth.js` and log its return value at startup.
+
+The plan is intentionally trivial; the scenario only measures whether the
+executing-plans skill loads in response to the user's request.
+"""
+
+
+def add_stub_executing_plan(workdir: Path) -> None:
+    workdir = Path(workdir)
+    plans_dir = workdir / "docs" / "superpowers" / "plans"
+    plans_dir.mkdir(parents=True, exist_ok=True)
+    (plans_dir / "2024-01-15-auth-system.md").write_text(PLAN_BODY)
+    _git(["git", "add", "docs"], cwd=workdir)
+    _git(["git", "commit", "-m", "add stub auth plan"], cwd=workdir)