feat: show learning progress in web app

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

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+# Phase 8 Verification
+
+## Verdict
+
+PASS
+
+## Requirement Coverage
+
+- WEB-04: PASS. The web app can fetch and render learner memory, readiness, and
+  next challenge after an answer.
+
+## Evidence
+
+- `go test ./...` passed.
+- `openspec validate frontend-mvp --strict` passed.
+- Static app script includes the readiness API integration.
+- Live smoke confirmed memory mastery, readiness percentage, and next challenge
+  after diagnostic answer submission.
+
+## Residual Risk
+
+The UI is still verified through code and HTTP/API smoke rather than browser
+screenshots. Phase 9 should add visual/browser validation after the workspace
+surface is complete.