feat: add material asset workspace

.planning/phases/009-material-asset-workspace/009-CONTEXT.md

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+# Phase 9 Context: Material and Asset Workspace
+
+**Status:** Ready for execution
+**Started:** 2026-04-26
+
+## Goal
+
+Expose material ingestion, ontology inspection, and teaching asset prompt
+candidate generation in the web app.
+
+## Requirements
+
+- WEB-05: Operator can ingest source material from the web app.
+- WEB-06: Operator can inspect ontology candidate concepts, edges, and gaps.
+- WEB-07: Operator can generate and inspect teaching asset prompt candidates.
+- WEB-08: Web UI includes loading, empty, and error states for the MVP flows.
+
+## UX Direction
+
+Keep content operations as a secondary workspace below the diagnostic answer
+surface. The operator flow should show provenance and candidate status without
+turning the page into an admin dashboard.
+
+## Out of Scope
+
+- Full ontology editor.
+- Human review promotion controls.
+- Actual image generation.