Point internal links at clean episode URLs and retire the JS page

tests/test_no_legacy_episode_urls.py

@@ -0,0 +1,35 @@
+import re
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parent.parent
+LEGACY = "episode.html?slug="
+
+
+def _files():
+    for pattern in ("website/*.html", "website/js/*.js", "website/llms.txt", "*.py"):
+        yield from ROOT.glob(pattern)
+
+
+def test_no_source_file_builds_a_legacy_episode_url():
+    offenders = []
+    for f in _files():
+        if f.name == "_worker.js":
+            continue  # the worker's reference is the redirect itself
+        if LEGACY in f.read_text(errors="replace"):
+            offenders.append(str(f.relative_to(ROOT)))
+    assert not offenders, f"legacy episode URLs still present: {offenders}"
+
+
+def test_client_rendered_episode_page_is_gone():
+    assert not (ROOT / "website" / "episode.html").exists()
+    assert not (ROOT / "website" / "js" / "episode.js").exists()
+
+
+def test_worker_still_redirects_legacy_urls():
+    worker = (ROOT / "website" / "_worker.js").read_text()
+    assert "/episode.html" in worker and "301" in worker
+
+
+def test_redirects_file_has_no_dead_episode_target():
+    redirects = (ROOT / "website" / "_redirects").read_text()
+    assert "/episode 302" not in redirects