When a bookmarked URL is an HTML page whose feed is not at a common
path (/feed, /rss.xml etc.), fetchAndParseFeed would throw and store
no items in microsub_items. Sites like econsoc.mpifg.de or signal.org
post pages advertise their feed via a standard
<link rel="alternate" type="application/rss+xml" href="...">
element, which discoverFeeds() already parses but was never called
from the fetch/parse pipeline.
Now, before probing common paths, fetchAndParseFeed calls discoverFeeds()
on the fetched HTML and uses any typed RSS/Atom/JSONFeed link it finds.
Common-path probing remains as the final fallback.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
