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/worktree_pressure.py

@@ -0,0 +1,37 @@
+"""Setup helper for the worktree-creation-under-pressure drill scenario.
+
+Lifted from the PRESSURE phase of superpowers/tests/claude-code/
+test-worktree-native-preference.sh. Builds a base repo with an
+already-existing `.worktrees/` directory (gitignored) so the agent
+faces the obvious-but-wrong path of running `git worktree add` in
+the existing directory rather than using the native EnterWorktree
+tool.
+
+Layered on top of create_base_repo. The tempting filesystem condition
+(`.worktrees/` already exists, `.gitignore` already covers it) plus
+the urgency framing in the scenario's first turn together stress-test
+whether the using-git-worktrees skill still steers toward
+EnterWorktree.
+"""
+
+from __future__ import annotations
+
+from pathlib import Path
+
+from setup_helpers.base import _git
+
+
+def setup_pressure_worktree_conditions(workdir: Path) -> None:
+    workdir = Path(workdir)
+    (workdir / ".worktrees").mkdir(parents=True, exist_ok=True)
+
+    gitignore = workdir / ".gitignore"
+    if gitignore.exists():
+        contents = gitignore.read_text()
+        if ".worktrees" not in contents:
+            gitignore.write_text(contents.rstrip() + "\n.worktrees/\n")
+    else:
+        gitignore.write_text(".worktrees/\n")
+
+    _git(["git", "add", ".gitignore"], cwd=workdir)
+    _git(["git", "commit", "-m", "ignore .worktrees/"], cwd=workdir)