feat: adopt CodSpeed-style pass/fail stats in the report header

The status line now reads '❌ 2 failures · ✅ 4 passed (6 scopes)' on
failure and '✅ 11 passed (11 scopes)' on success, mirroring the compact
emoji-plus-count style of CodSpeed reports so the pass ratio is visible
without scanning the table.

Author: shenxianpeng

main.py

@@ -475,29 +475,31 @@ def _markdown_passed_details(results: list[ScopeResult]) -> str:
 def render_report(results: list[ScopeResult], include_footer: bool = True) -> str:
     """Render the Markdown report shared by the job summary and PR comment.
 
-    The report opens with the plain title line followed by the status line:
-    ``✅ All checks passed (N scopes)`` on success, or the failure count on
-    failure, followed by a scope table with rule links and collapsible
-    failure details.
+    The report opens with the plain title line followed by a CodSpeed-style
+    status line: ``✅ **N passed** (N scopes)`` on success, or
+    ``❌ **N failures** · ✅ **M passed** (N scopes)`` on failure, followed
+    by a scope table with rule links and collapsible details.
     """
     if all(scope.status == "pass" for scope in results):
         scopes = "scope" if len(results) == 1 else "scopes"
         lines = [
             REPORT_TITLE,
             "",
-            f"✅ All checks passed ({len(results)} {scopes})",
+            f"✅ **{len(results)} passed** ({len(results)} {scopes})",
             "",
             _markdown_passed_details(results),
         ]
         return "\n".join(lines)
 
     failures = _failure_count(results)
     unit = "failure" if failures == 1 else "failures"
+    passed = sum(1 for scope in results if scope.status == "pass")
     scopes = "scope" if len(results) == 1 else "scopes"
     lines = [
         REPORT_TITLE,
         "",
-        f"❌ **{failures} {unit}** across {len(results)} {scopes}",
+        f"❌ **{failures} {unit}** · ✅ **{passed} passed** "
+        f"({len(results)} {scopes})",
         "",
         _markdown_table(results),
         "",

main_test.py

@@ -632,7 +632,7 @@ class TestRenderJobSummary(unittest.TestCase):
     def test_all_pass(self):
         body = main.render_job_summary([pass_scope("Branch", value="main")])
         self.assertTrue(body.startswith(main.REPORT_TITLE))
-        self.assertIn("All checks passed (1 scope)", body)
+        self.assertIn("✅ **1 passed** (1 scope)", body)
         self.assertIn("<details>", body)
         self.assertIn("<summary>Show details</summary>", body)
         self.assertIn("```text", body)
@@ -669,7 +669,7 @@ def test_all_pass_without_value_shows_plain_label(self):
     def test_failure_renders_table_with_rule_links(self):
         body = main.render_job_summary([fail_scope("Commit 1/1")])
         self.assertTrue(body.startswith(main.REPORT_TITLE))
-        self.assertIn("**1 failure** across 1 scope", body)
+        self.assertIn("❌ **1 failure** · ✅ **0 passed** (1 scope)", body)
         self.assertIn("| Scope | Checked value | Failed checks | Result |", body)
         self.assertIn(
             "| Commit 1/1 | `bad message` | "
@@ -704,14 +704,14 @@ def test_all_pass_matches_job_summary(self):
         summary = main.render_job_summary([pass_scope("Branch")])
         self.assertEqual(comment, summary)
         self.assertTrue(comment.startswith(main.REPORT_TITLE))
-        self.assertIn("All checks passed (1 scope)", comment)
+        self.assertIn("✅ **1 passed** (1 scope)", comment)
 
     def test_failure_matches_job_summary(self):
         comment = main.render_pr_comment([fail_scope("Commit 1/1")])
         summary = main.render_job_summary([fail_scope("Commit 1/1")])
         self.assertEqual(comment, summary)
         self.assertTrue(comment.startswith(main.REPORT_TITLE))
-        self.assertIn("**1 failure** across 1 scope", comment)
+        self.assertIn("❌ **1 failure** · ✅ **0 passed** (1 scope)", comment)
         self.assertIn("| Scope | Checked value | Failed checks | Result |", comment)
 
 
@@ -741,7 +741,7 @@ def test_success_writes_policy_report(self):
         self.assertEqual(rc, 0)
         with open(summary_path, encoding="utf-8") as file_obj:
             content = file_obj.read()
-        self.assertIn("All checks passed", content)
+        self.assertIn("✅ **1 passed** (1 scope)", content)
 
     def test_failure_returns_nonzero(self):
         summary_path = os.path.join(tempfile.mkdtemp(), "summary.txt")