feat: show learning progress in web app

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

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+# Phase 8 Plan: Learning Progress View
+
+**Status:** Ready for execution
+**Phase Goal:** Close the practice loop with visible learning progress.
+
+## Tasks
+
+### 1. Add progress UI region
+
+- Add learner progress section to the right context pane.
+- Include manual refresh affordance.
+
+### 2. Fetch progress after answer
+
+- Fetch learner memory, readiness map, and next challenge after grading.
+- Render empty/error states when progress is unavailable.
+
+### 3. Verify
+
+- Add/update web app tests for progress asset content.
+- Run Go tests, OpenSpec validation, line-count check, and live smoke.
+
+## Out of Scope
+
+- Charts.
+- Historical progress storage.