The lightnovelworld chapter branch no longer derives the Series address by
string-manipulating the chapter path: on ~7% of novels the Chapter Slug
diverges from the Series slug and the derived address 404s on every Poll.
The identity now comes from the page's own a[aria-label='All Chapter']
pointer (breadcrumb's second crumb as fallback), validated as a
lightnovelworld.net /novel/<slug>/ address; no pointer resolves to
type: other. The Chapter Slug rides on the detected page object only
(chapterSlug; null on a series page) and is written to no store, for the
stale-row repair in #90.
Harness: document.querySelector now answers attribute selectors with an
element exposing getAttribute (attrEls table, cleared by reset()).
AGENTS.md records that the Series address is discovered, not derived.
sulthan
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