diff --git a/scripts/tests/test_repo_docs_link_drift.py b/scripts/tests/test_repo_docs_link_drift.py
new file mode 100644
index 000000000..3093bc65e
--- /dev/null
+++ b/scripts/tests/test_repo_docs_link_drift.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+"""Guard runtime code against GitHub main docs-link drift."""
+
+from __future__ import annotations
+
+import unittest
+from pathlib import Path
+
+
+REPO_ROOT = Path(__file__).resolve().parents[2]
+
+FORBIDDEN_SNIPPETS = (
+    "https://github.com/rcourtman/Pulse/blob/main/",
+    "https://raw.githubusercontent.com/rcourtman/Pulse/main/docs/",
+)
+
+SKIP_DIR_NAMES = {
+    ".git",
+    ".next",
+    ".pytest_cache",
+    "dist",
+    "node_modules",
+    "tmp",
+}
+
+SKIP_PATH_PARTS = {
+    "docs/release-control",
+    "frontend-modern/public/docs",
+}
+
+SKIP_FILE_SUFFIXES = (
+    ".png",
+    ".jpg",
+    ".jpeg",
+    ".gif",
+    ".ico",
+    ".pdf",
+    ".svg",
+    ".woff",
+    ".woff2",
+    ".ttf",
+)
+
+
+def should_skip(rel_path: str) -> bool:
+    if any(part in SKIP_DIR_NAMES for part in Path(rel_path).parts):
+        return True
+    if any(fragment in rel_path for fragment in SKIP_PATH_PARTS):
+        return True
+
+    name = Path(rel_path).name
+    if name.endswith((".test.ts", ".test.tsx", ".test.js", ".test.jsx", ".spec.ts", ".spec.tsx", ".spec.js", ".spec.jsx")):
+        return True
+    if name.endswith("_test.py") or name.startswith("test_"):
+        return True
+    if name.endswith(".log"):
+        return True
+    if rel_path.endswith(SKIP_FILE_SUFFIXES):
+        return True
+    return False
+
+
+class RepoDocsLinkDriftTest(unittest.TestCase):
+    def test_runtime_files_do_not_reference_github_main_docs(self) -> None:
+        offenders: list[str] = []
+
+        for path in REPO_ROOT.rglob("*"):
+            if not path.is_file():
+                continue
+
+            rel_path = path.relative_to(REPO_ROOT).as_posix()
+            if should_skip(rel_path):
+                continue
+
+            try:
+                content = path.read_text(encoding="utf-8")
+            except UnicodeDecodeError:
+                continue
+
+            for snippet in FORBIDDEN_SNIPPETS:
+                if snippet in content:
+                    offenders.append(f"{rel_path}: {snippet}")
+
+        self.assertEqual(
+            offenders,
+            [],
+            msg="runtime files still reference GitHub main docs:\n- " + "\n- ".join(offenders),
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()