feat: add material asset workspace

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

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+# Phase 9 Verification
+
+## Verdict
+
+PASS
+
+## Requirement Coverage
+
+- WEB-05: PASS. The web app includes material ingestion UI wired to the real
+  backend API.
+- WEB-06: PASS. The web app renders ontology candidate concept, edge, and gap
+  counts and candidate concept labels.
+- WEB-07: PASS. The web app can generate and inspect teaching asset prompt
+  candidates.
+- WEB-08: PASS. The MVP frontend includes loading, empty, and error states for
+  diagnostic, progress, material, and asset prompt flows.
+
+## Evidence
+
+- `go test ./...` passed.
+- `openspec validate frontend-mvp --strict` passed.
+- Live material ingestion and teaching asset prompt smoke passed.
+- Static app script contains material and teaching asset API integration.
+- Source files remain under 600 lines.
+
+## Residual Risk
+
+Chrome DevTools MCP timed out while opening the local page, so browser
+screenshot verification is still pending. HTTP/API smoke confirms the served
+assets and backend flows, but a visual pass should be repeated when the browser
+tool is responsive.