feat(validation): link run and fixture in regression summary

validation/docs/regression-testing.md

@@ -224,9 +224,9 @@ Expected output for a clean run:
 ```
 ## Regression Runner — N/N branches PASS
 
-| Branch | Result | Matched | Missing | Unexpected | Summary |
-|---|---|---:|---:|---:|---|
-| `regression/r4.3-main-baseline` | PASS | 27 | 0 | 0 | - |
+| Branch | Result | Matched | Missing | Unexpected | Summary | Run | Fixture |
+|---|---|---:|---:|---:|---|---|---|
+| `regression/r4.3-main-baseline` | PASS | 27 | 0 | 0 | - | [run](https://github.com/camaraproject/ReleaseTest/actions/runs/1234567890) | [fixture](https://github.com/camaraproject/ReleaseTest/blob/regression/r4.3-main-baseline/.regression/regression-expected.yaml) |
 PASS: 1/1 branches
 ```
 

validation/scripts/regression_runner.py

@@ -85,6 +85,8 @@ class DiffReport:
     missing: list[dict[str, Any]] = field(default_factory=list)
     unexpected: list[dict[str, Any]] = field(default_factory=list)
     summary_mismatch: str | None = None
+    repo: str | None = None
+    run_id: str | None = None
 
     @property
     def passed(self) -> bool:
@@ -356,21 +358,42 @@ def capture_to_yaml(
 # ---------------------------------------------------------------------------
 
 
+def _run_url(repo: str, run_id: str) -> str:
+    return f"https://github.com/{repo}/actions/runs/{run_id}"
+
+
+def _fixture_url(repo: str, branch: str) -> str:
+    return f"https://github.com/{repo}/blob/{branch}/.regression/regression-expected.yaml"
+
+
 def render_markdown(reports: dict[str, DiffReport]) -> str:
     """Render a per-branch PASS/FAIL summary as markdown."""
     total = len(reports)
     passed = sum(1 for r in reports.values() if r.passed)
     lines: list[str] = []
     lines.append(f"## Regression Runner — {passed}/{total} branches PASS")
     lines.append("")
-    lines.append("| Branch | Result | Matched | Missing | Unexpected | Summary |")
-    lines.append("|---|---|---:|---:|---:|---|")
+    lines.append(
+        "| Branch | Result | Matched | Missing | Unexpected | Summary | Run | Fixture |"
+    )
+    lines.append("|---|---|---:|---:|---:|---|---|---|")
     for branch, report in sorted(reports.items()):
         status = "PASS" if report.passed else "FAIL"
         summary_note = report.summary_mismatch or "-"
+        run_link = (
+            f"[run]({_run_url(report.repo, report.run_id)})"
+            if report.repo and report.run_id
+            else "-"
+        )
+        fixture_link = (
+            f"[fixture]({_fixture_url(report.repo, branch)})"
+            if report.repo
+            else "-"
+        )
         lines.append(
             f"| `{branch}` | {status} | {report.matched} | "
-            f"{len(report.missing)} | {len(report.unexpected)} | {summary_note} |"
+            f"{len(report.missing)} | {len(report.unexpected)} | {summary_note} | "
+            f"{run_link} | {fixture_link} |"
         )
     for branch, report in sorted(reports.items()):
         if report.passed:
@@ -669,6 +692,8 @@ def run_branch(
 
     report = diff_findings(expected, actual, actual_summary=summary)
     report.branch = branch
+    report.repo = repo
+    report.run_id = run_id
     return report
 
 
@@ -710,7 +735,7 @@ def capture_branch(
         )
         tooling_ref = None
 
-    run_url = f"https://github.com/{repo}/actions/runs/{run_id}"
+    run_url = _run_url(repo, run_id)
 
     text = capture_to_yaml(
         actual,

validation/tests/test_regression_runner.py

@@ -446,3 +446,29 @@ def test_all_pass_no_detail_section(self) -> None:
         assert "1/1 branches PASS" in text
         assert "PASS" in text
         assert "diff detail" not in text
+
+    def test_links_to_run_and_fixture(self) -> None:
+        report = DiffReport(
+            branch="regression/clean",
+            match_mode="exact",
+            matched=27,
+            repo="camaraproject/ReleaseTest",
+            run_id="123456",
+        )
+        text = render_markdown({"regression/clean": report})
+        assert (
+            "https://github.com/camaraproject/ReleaseTest/actions/runs/123456"
+            in text
+        )
+        assert (
+            "https://github.com/camaraproject/ReleaseTest/blob/"
+            "regression/clean/.regression/regression-expected.yaml"
+            in text
+        )
+
+    def test_missing_repo_or_run_id_falls_back_to_dash(self) -> None:
+        report = DiffReport(
+            branch="regression/clean", match_mode="exact", matched=27,
+        )
+        text = render_markdown({"regression/clean": report})
+        assert "| - | - |" in text