Generate the episode page after publishing, not before

regenerate_website_pages() ran at step 3.7, before the step-4 publish call.
generate_episode_pages.py is driven entirely by the RSS feed, so the episode
being published was never in the data it read: the generator exited 0, printed
its success line, and silently omitted the new episode. Its page only appeared
on the NEXT publish.

Social posts link to /episode/<slug>/, so every launch-day link across X,
Bluesky, Discord, Instagram, Threads, Facebook, LinkedIn, Mastodon and Nostr
404'd during exactly the window the post was circulating. That held for all 58
published episodes.

The existing test only asserted the generator gets invoked with --sitemap,
which passed throughout. Added two tests pinning the call between the publish
and the wrangler deploy, verified to fail against the previous ordering.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_publish_regenerates_pages.py

@@ -78,3 +78,39 @@ def test_publish_flow_calls_it_after_copying_the_transcript():
     copy_at = source.index("Transcript copied to website/transcripts/")
     call_at = source.index("regenerate_website_pages()", copy_at)
     assert call_at > copy_at
+
+
+def test_generator_runs_after_the_publish_call():
+    """Ordering regression guard.
+
+    generate_episode_pages.py is driven entirely by the RSS feed, so it only
+    sees an episode once Castopod has published it. For 58 episodes the
+    regenerate call sat at step 3.7 — before the step-4 publish — so the
+    episode being published was silently absent from its own run and its page
+    only appeared on the NEXT publish. Social posts link to /episode/<slug>/,
+    so every launch-day link 404'd.
+
+    Asserted on source order because the surrounding publish flow does network
+    and filesystem work that isn't practical to drive end to end here.
+    """
+    src = Path(publish_episode.__file__).read_text()
+    body = src[src.index("def main("):]
+
+    publish_call = body.index("published = publish_episode(")
+    regen_call = body.index("regenerate_website_pages()")
+    deploy_call = body.index("wrangler")
+
+    assert publish_call < regen_call, (
+        "regenerate_website_pages() must run AFTER publish_episode(), or the new "
+        "episode is missing from the feed the generator reads"
+    )
+    assert regen_call < deploy_call, (
+        "regenerate_website_pages() must run BEFORE the wrangler deploy, or the "
+        "freshly built page never ships"
+    )
+
+
+def test_regenerate_is_called_exactly_once_in_main():
+    src = Path(publish_episode.__file__).read_text()
+    body = src[src.index("def main("):]
+    assert body.count("regenerate_website_pages()") == 1