feat(skills): install deepeval skill from confident-ai/deepeval

Adds the deepeval eval-loop skill via `npx skills add` with skills-lock.json
for reproducible reinstalls. Symlinked to Claude Code via .claude/skills/.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016z2ZFYHQCex8yZAMVMTZzZ

.agents/skills/deepeval/templates/test_multi_turn_e2e.py

@@ -0,0 +1,28 @@
+from importlib import import_module
+
+import pytest
+
+from deepeval import assert_test
+from deepeval.dataset import EvaluationDataset
+from deepeval.simulator import ConversationSimulator
+
+from metrics import MULTI_TURN_METRICS
+
+MAX_TURNS = 10
+ai_app = import_module("ai_app")
+
+
+simulator = ConversationSimulator(model_callback=ai_app.chatbot_callback)
+dataset = EvaluationDataset()
+dataset.add_goldens_from_json_file(file_path="tests/evals/.dataset.json")
+
+
+@pytest.mark.parametrize(
+    "test_case",
+    simulator.simulate(
+        conversational_goldens=dataset.goldens,
+        max_user_simulations=MAX_TURNS,
+    ),
+)
+def test_multi_turn(test_case):
+    assert_test(test_case=test_case, metrics=MULTI_TURN_METRICS)