test(ci): split netem interop summaries into local and GitHub-specific reports

Create separate markdown files for local browsing with relative links and GitHub Action summaries with artifact notices. This ensures the GitHub Step Summary remains readable and informative without broken links.

.github/workflows/interop-netem.yml

@@ -60,11 +60,11 @@ jobs:
       - name: Append netem interop summary
         if: always()
         run: |
-          latest_summary="$(find target/interop-netem -mindepth 2 -maxdepth 2 -name summary.md -type f -print 2>/dev/null | sort | tail -n 1)"
+          latest_summary="$(find target/interop-netem -mindepth 2 -maxdepth 2 -name github-step-summary.md -type f -print 2>/dev/null | sort | tail -n 1)"
           if [ -n "$latest_summary" ]; then
             cat "$latest_summary" >> "$GITHUB_STEP_SUMMARY"
           else
-            echo "No netem interop summary.md found." >> "$GITHUB_STEP_SUMMARY"
+            echo "No netem interop github-step-summary.md found." >> "$GITHUB_STEP_SUMMARY"
           fi
 
       - name: Upload netem interop artifacts

scripts/run_netem_interop_ci.py

@@ -613,20 +613,50 @@ def format_optional(value: Any) -> str:
 
 def write_run_summary(run_dir: Path, results: list[dict[str, Any]]) -> None:
     write_json(run_dir / "netem-summary.json", {"results": results})
+    (run_dir / "summary.md").write_text(
+        build_run_summary_markdown(results, link_scenarios=True, include_artifact_note=False),
+        encoding="utf-8",
+    )
+    (run_dir / "github-step-summary.md").write_text(
+        build_run_summary_markdown(results, link_scenarios=False, include_artifact_note=True),
+        encoding="utf-8",
+    )
+
+
+def build_run_summary_markdown(
+    results: list[dict[str, Any]],
+    *,
+    link_scenarios: bool,
+    include_artifact_note: bool,
+) -> str:
     lines = [
         "# Netem IRTT Interop Run",
         "",
-        "| scenario | classification | expected RTT us | upstream median RTT us | irtt-rs median RTT us | upstream loss % | irtt-rs loss % | mean RTT delta us |",
-        "| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: |",
     ]
+    if include_artifact_note:
+        lines.extend(
+            [
+                "Detailed per-scenario files are available in the uploaded `interop-netem` artifact.",
+                "",
+            ]
+        )
+    lines.extend(
+        [
+            "| scenario | classification | expected RTT us | expected loss % | upstream median RTT us | irtt-rs median RTT us | upstream loss % | irtt-rs loss % | mean RTT delta us |",
+            "| --- | --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: |",
+        ]
+    )
     for result in results:
         scenario = result["scenario"]
         upstream = result["upstream"]
         rust = result["irtt_rs"]
+        scenario_name = scenario["name"]
+        scenario_cell = f"[{scenario_name}]({scenario_name}/summary.md)" if link_scenarios else scenario_name
         lines.append(
-            f"| [{scenario['name']}]({scenario['name']}/summary.md) | "
+            f"| {scenario_cell} | "
             f"{result['classification']} | "
             f"{format_optional(scenario.get('expected_rtt_us'))} | "
+            f"{format_optional(result.get('expected_loss_percent'))} | "
             f"{format_optional(upstream.get('rtt_median_us'))} | "
             f"{format_optional(rust.get('rtt_median_us'))} | "
             f"{format_optional(upstream.get('loss_percent'))} | "
@@ -637,11 +667,16 @@ def write_run_summary(run_dir: Path, results: list[dict[str, Any]]) -> None:
     warnings = [(result["scenario"]["name"], item) for result in results for item in result["warnings"]]
     if failures:
         lines.extend(["", "## Failures"])
-        lines.extend(f"- [{scenario}]({scenario}/summary.md): {item}" for scenario, item in failures)
+        lines.extend(format_run_summary_item(scenario, item, link_scenarios) for scenario, item in failures)
     if warnings:
         lines.extend(["", "## Warnings"])
-        lines.extend(f"- [{scenario}]({scenario}/summary.md): {item}" for scenario, item in warnings)
-    (run_dir / "summary.md").write_text("\n".join(lines) + "\n", encoding="utf-8")
+        lines.extend(format_run_summary_item(scenario, item, link_scenarios) for scenario, item in warnings)
+    return "\n".join(lines) + "\n"
+
+
+def format_run_summary_item(scenario: str, item: str, link_scenarios: bool) -> str:
+    scenario_label = f"[{scenario}]({scenario}/summary.md)" if link_scenarios else scenario
+    return f"- {scenario_label}: {item}"
 
 
 def stop_process(proc: subprocess.Popen[bytes]) -> None: