test: add issue 658 verification doc coverage

tests/test_issue_658_verification.py

@@ -0,0 +1,24 @@
+from pathlib import Path
+
+
+def test_issue_658_verification_doc_exists_with_mainline_pr_triage_evidence() -> None:
+    text = Path("docs/issue-658-verification.md").read_text(encoding="utf-8")
+
+    required_snippets = [
+        "# Issue #658 Verification",
+        "## Status: ✅ ALREADY IMPLEMENTED ON MAIN",
+        "scripts/pr_backlog_triage.py",
+        "scripts/pr-backlog-triage.py",
+        "scripts/pr-triage-automation.py",
+        "tests/test_pr_backlog_triage.py",
+        "PR #763",
+        "closed unmerged",
+        "python3 scripts/pr_backlog_triage.py Timmy_Foundation/timmy-config --json",
+        "pytest -q tests/test_pr_backlog_triage.py",
+        "26 open PRs",
+        "duplicate PRs",
+        "stale PRs",
+    ]
+
+    missing = [snippet for snippet in required_snippets if snippet not in text]
+    assert not missing, missing