subscribe to site.standard.document/publication collections
- adds STANDARD_DOCUMENT and STANDARD_PUBLICATION constants
- isDocumentCollection() and isPublicationCollection() helper functions
- TAP now processes both pub.leaflet.* and site.standard.* records
- extractor handles both via textContent (standard) and block parsing (leaflet)
this enables indexing pckt.blog content alongside leaflet.pub
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>