feat: propagate execution evidence across iterations and enhance reports

- Carry execution evidence forward so reviewer/senior prompts in
  subsequent iterations can inspect prior transcript and command data
- Add {execution_evidence} to REVIEW_ONLY templates (en/ko)
- Add evidence summary table to iteration reports
- Fix test_agentic to match stdin-based prompt delivery for Claude
- Add expanded claim/no-change marker tests and cross-iteration
  evidence propagation tests

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

cross_eval/pipeline.py

@@ -338,6 +338,13 @@ def _run_simple_pipeline(
                     if tracker:
                         input_contents["previous_senior_tracker"] = tracker
 
+            # Carry execution evidence forward so subsequent iterations'
+            # reviewer/senior prompts can inspect prior transcript data.
+            if step_results:
+                input_contents["execution_evidence"] = _format_execution_evidence(
+                    step_results,
+                )
+
             iterations.append(iter_result)
 
             # ESCALATE check (highest priority)
@@ -531,6 +538,13 @@ def _run_phased_pipeline(
                         if tracker:
                             input_contents["previous_senior_tracker"] = tracker
 
+                # Carry execution evidence forward so subsequent iterations'
+                # reviewer/senior prompts can inspect prior transcript data.
+                if step_results:
+                    input_contents["execution_evidence"] = _format_execution_evidence(
+                        step_results,
+                    )
+
                 iterations.append(iter_result)
 
                 # ESCALATE check
@@ -1133,16 +1147,33 @@ def _build_context(
     max_iterations: int,
     step_results: dict[str, AgentResult] | None = None,
 ) -> dict[str, str]:
-    """Build the template context dict."""
+    """Build the template context dict.
+
+    Execution evidence from prior iterations is carried forward in
+    ``input_contents["execution_evidence"]``.  When the current iteration
+    has its own step results, the evidence is merged so reviewers/seniors
+    see both prior and current data.
+    """
     context: dict[str, str] = {}
     context.update(input_contents)
     context.update(step_outputs)
     context["feedback"] = feedback
     context["iteration"] = str(iteration)
     context["max_iterations"] = str(max_iterations)
-    # Surface execution evidence from prior steps so reviewers can inspect it
+    # Surface execution evidence from prior steps so reviewers can inspect it.
+    # Prior-iteration evidence may already live in context via input_contents.
+    prior_evidence = context.get("execution_evidence", "")
     if step_results:
-        context["execution_evidence"] = _format_execution_evidence(step_results)
+        current_evidence = _format_execution_evidence(step_results)
+        if prior_evidence and prior_evidence != "(no prior execution evidence)":
+            context["execution_evidence"] = (
+                "# Prior Iteration Evidence\n"
+                + prior_evidence
+                + "\n\n# Current Iteration Evidence\n"
+                + current_evidence
+            )
+        else:
+            context["execution_evidence"] = current_evidence
     return context
 
 
@@ -1164,6 +1195,7 @@ def _format_execution_evidence(
             f"- Command: `{result.command_preview}`" if result.command_preview else "",
             f"- Exit code: {result.exit_code}",
             f"- Duration: {result.duration_seconds}s",
+            f"- Output size: {len(result.output)} chars",
         ]
         section = [line for line in section if line]
         if result.transcript: