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/scenarios/executing-waves-minimal.yaml

@@ -0,0 +1,36 @@
+scenario: executing-waves-minimal
+description: "Minimal wave execution — 1 sequential task + 2 parallel tasks"
+user_posture: spec-aware
+
+setup:
+  helpers:
+    - create_waves_file_minimal
+  assertions:
+    - "git rev-parse --is-inside-work-tree"
+    - "git branch --show-current | grep feature/test-implementation"
+    - "test -f docs/superpowers/plans/test-plan.waves.md"
+    - "grep -q 'status: approved' docs/superpowers/plans/test-plan.waves.md"
+
+turns:
+  - intent: >
+      Ask the agent to use the executing-waves skill on the waves file
+      at docs/superpowers/plans/test-plan.waves.md. Reference the skill
+      by name.
+  - intent: >
+      Observe execution. Let the agent proceed autonomously. If the
+      agent asks for any confirmation, answer "proceed" or equivalent.
+  - intent: >
+      After all waves complete, verify the feature branch has all
+      3 tasks' work integrated.
+
+limits:
+  max_turns: 50
+  turn_timeout: 600
+
+verify:
+  criteria:
+    - "Agent invoked the executing-waves skill"
+    - "git log shows commits from all 3 tasks on feature branch"
+    - "git worktree list shows only main worktree (no orphaned worktrees)"
+    - "Wave 2 used worktree isolation for parallel tasks (visible in terminal output or git log merge commits)"
+  observe: true