Product surface: ZOIN notes+docs workspace — Document Composer + inline PDF viewer (pw#76 item 10)

[mdheller]

Product surface for the Knowledge Hub (pw#76 item 10). The ZOIN-style notes+documents workspace (reference frame 3).

Surface

• Nav: Daily Notes · Documents · Graph · Gallery.
• Document Composer beside an inline PDF Viewer: annotate the PDF, compose notes alongside, export.
• The Graph view renders the KG built from annotations + documents (the knowledge-construction ladder: text → … → KG).

Consume, don't reinvent

• PDF annotations flow through the landed annotation→KG contract (tools/graphrag-grounding/annotation_kg.py, pw#103) — same provenance seal + evidence grade, same HellGraph write shape.
• Grounded answers over the workspace corpus use the GraphRAG grounded-answer-with-page-reference contract (pw#103): every answer carries resolvable page_refs and is receipted; the PDF viewer can jump to the cited page.
• Reuse workspace-content-model for the Document/Note model.

This issue = the workspace runtime + UI

• Vue surfaces for Daily Notes / Documents / Graph / Gallery.
• Document Composer + inline PDF viewer (annotate + export) wired to the annotation overlay (pw#104).
• Graph view bound to the KG (HellGraph).

Refs pw#76 item 10, pw#103, pw#104, workspace-content-model.