Every episode page linked back to index.html, so the only homepage URL
Google crawled was the one the canonical tag points away from.

Assisted-by: Claude Opus 5 via Claude Code

diff --git a/lib/pages/episode.html.erb b/lib/pages/episode.html.erb
index 89c79b3..6181b33 100644
--- a/lib/pages/episode.html.erb
+++ b/lib/pages/episode.html.erb
@@ -1,4 +1,4 @@
-<a class="back" href="index.html">← All episodes</a>
+<a class="back" href="./">← All episodes</a>
 <h1 data-pagefind-sort="episode_number:<%= ep.fetch(:number) %>"><%= CGI.escapeHTML("#{ep.fetch(:number)}. #{ep.fetch(:title)}") %></h1>
 
 <% ep.fetch(:text).split("\n\n").each do |para| %>