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SHARD-WP-0003 T6. Enterprise document-collab contrast to Notion: a doc + spreadsheet hybrid where a page is prose interleaved with embedded live structured objects (spreadsheets, kanban/calendar live apps), reachable only by REST with HTML import/export (lossy to Markdown), gated by Salesforce identity/ACL. Generalizes external-API mode with an HTML payload-format facet (beside Notion block-JSON, Wiki.js GraphQL); pushes page model toward inline embedded structured objects. UC-80. Enriched UC-57/55/58/36/06. Marks T6 done. Feeds SHARD-WP-0002 T11/T12/T14. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>