A --resume run rebuilt the episode title from the Castopod URL slug, which is
lowercased and stripped of punctuation, so episode 58 went to YouTube as
"Episode 58: Rayfield S Nephew The Marfa Lights And Why Nobody Believes Concho"
with a placeholder description. save_chapters() only persisted chapters, so
resume had no real metadata to fall back on.
Metadata is now written to <audio>.metadata.json during a normal run and read
back on resume. If that file is missing (episodes published before this change)
the title and description are read from Castopod instead. Slug reconstruction
survives only as a last resort: it warns loudly, flags the result, and anchors
the episode prefix strip so it no longer eats the phrase mid-title.
Reading back from Castopod needed its own fix — TO_BASE64 wraps every 76 chars
and mysql renders those breaks as a literal backslash-n, which made b64decode
throw and the lookup silently return None.
Also includes two changes that were already sitting in the working tree: the
YouTube tag budget fix that episode 58's invalidTags failure prompted (with its
test), and a metadata model bump to claude-haiku-4.5.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
