feat: show learning progress in web app

.planning/phases/008-learning-progress-view/008-SUMMARY.md

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+# Phase 8 Summary
+
+**Status:** Complete
+**Completed:** 2026-04-26
+
+## Delivered
+
+- Added learning progress region to the web app right context pane.
+- Added manual progress refresh action.
+- After answer submission, the app fetches learner memory, readiness map, and
+  next challenge.
+- Rendered readiness percentage, concept mastery states, and recommended next
+  challenge.
+- Added frontend asset test coverage for progress API wiring.
+
+## Verification
+
+```powershell
+gofmt -w cmd internal
+go test ./...
+openspec validate frontend-mvp --strict
+```
+
+Additional smoke check:
+
+- Submitted a diagnostic answer, then verified learner memory, readiness, and
+  next challenge APIs returned progress consumed by the app script.
+
+## Deferred
+
+- Browser screenshot audit.
+- Charts and historical progress.
+- Editable learner memory.