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_actor.py

@@ -0,0 +1,51 @@
+from drill.actor import Actor, ActorAction
+
+
+class TestActorAction:
+    def test_parse_type_action(self):
+        action = ActorAction.from_tool_result({"action": "type", "text": "create a worktree"})
+        assert action.action == "type"
+        assert action.text == "create a worktree"
+
+    def test_parse_done_action(self):
+        action = ActorAction.from_tool_result({"action": "done"})
+        assert action.action == "done"
+
+    def test_parse_stuck_action(self):
+        action = ActorAction.from_tool_result({"action": "stuck"})
+        assert action.action == "stuck"
+
+    def test_parse_key_action(self):
+        action = ActorAction.from_tool_result({"action": "key", "key": "ctrl-c"})
+        assert action.action == "key"
+        assert action.key == "ctrl-c"
+
+
+class TestActorPrompt:
+    def test_builds_system_prompt_naive(self):
+        actor = Actor(model="claude-sonnet-4-6", temperature=0.7)
+        prompt = actor.build_system_prompt(
+            posture="naive",
+            intents=["Ask the agent to create a worktree"],
+        )
+        assert "plain language" in prompt.lower() or "don't know" in prompt.lower()
+        assert "create a worktree" in prompt
+
+    def test_builds_system_prompt_spec_aware(self):
+        actor = Actor(model="claude-sonnet-4-6", temperature=0.7)
+        prompt = actor.build_system_prompt(
+            posture="spec-aware",
+            intents=["Use the worktree skill"],
+        )
+        assert "skill" in prompt.lower() or "convention" in prompt.lower()
+
+
+class TestActorContext:
+    def test_appends_terminal_captures(self):
+        actor = Actor(model="claude-sonnet-4-6", temperature=0.7)
+        actor.append_capture("Screen 1: Welcome to Claude")
+        actor.append_capture("Screen 2: ❯ ")
+        messages = actor.build_messages()
+        assert len(messages) == 2
+        assert "Screen 1" in messages[0]["content"]
+        assert "Screen 2" in messages[1]["content"]