Add trace and power fields to EvalResult and RunSummary (Task 5)

- Add trace_steps and trace_energy_joules to EvalResult
- Add avg_power_watts, total_input_tokens, total_output_tokens, and
  trace_step_type_stats to RunSummary
- Add 3 tests covering new field defaults and setters

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

evals/core/types.py

@@ -44,6 +44,8 @@ class EvalResult:
     energy_per_output_token_joules: float = 0.0
     throughput_per_watt: float = 0.0
     mean_itl_ms: float = 0.0
+    trace_steps: int = 0
+    trace_energy_joules: float = 0.0
 
 
 @dataclass(slots=True)
@@ -122,6 +124,10 @@ class RunSummary:
     warmup_samples_excluded: int = 0
     steady_state_reached: bool = False
     energy_method: str = ""
+    avg_power_watts: float = 0.0
+    total_input_tokens: int = 0
+    total_output_tokens: int = 0
+    trace_step_type_stats: Dict[str, Dict[str, float]] = field(default_factory=dict)
 
 
 # ---------------------------------------------------------------------------

evals/tests/test_types.py

@@ -209,6 +209,35 @@ class TestRunSummary:
 # ---------------------------------------------------------------------------
 
 
+class TestEvalResultTraceFields:
+    def test_trace_fields_exist(self):
+        r = EvalResult(record_id="test", model_answer="hi")
+        assert r.trace_steps == 0
+        assert r.trace_energy_joules == 0.0
+
+    def test_trace_fields_set(self):
+        r = EvalResult(
+            record_id="test", model_answer="hi",
+            trace_steps=5, trace_energy_joules=100.0,
+        )
+        assert r.trace_steps == 5
+        assert r.trace_energy_joules == 100.0
+
+
+class TestRunSummaryTraceFields:
+    def test_trace_aggregate_fields(self):
+        s = RunSummary(
+            benchmark="test", category="test", backend="test",
+            model="test", total_samples=1, scored_samples=1,
+            correct=1, accuracy=1.0, errors=0,
+            mean_latency_seconds=1.0, total_cost_usd=0.0,
+        )
+        assert s.avg_power_watts == 0.0
+        assert s.trace_step_type_stats == {}
+        assert s.total_input_tokens == 0
+        assert s.total_output_tokens == 0
+
+
 class TestMetaConfig:
     def test_defaults(self):
         m = MetaConfig()