feat: add material asset workspace

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

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+# Phase 9 Summary
+
+**Status:** Complete
+**Completed:** 2026-04-26
+
+## Delivered
+
+- Added material ingestion workspace to the web app.
+- Added ontology candidate summary with concept, edge, and gap counts.
+- Added candidate concept selector for teaching asset prompt generation.
+- Added asset type selector and prompt generation UI.
+- Rendered prompt text, model key, review state, evidence, and model-id
+  verification guard.
+- Added frontend asset test coverage for teaching asset API wiring.
+
+## Verification
+
+```powershell
+gofmt -w cmd internal
+go test ./...
+openspec validate frontend-mvp --strict
+```
+
+Additional smoke check:
+
+- Static app script includes material and teaching asset API wiring.
+- Material ingestion returned 4 concepts and 3 edges.
+- Teaching asset prompt generation returned `asset-prompt-1` with verification
+  guard enabled.
+
+## Deferred
+
+- Browser screenshot audit because Chrome DevTools MCP timed out.
+- Full ontology graph editor.
+- Real image generation.