docs: start frontend mvp milestone

openspec/changes/frontend-mvp/proposal.md

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+# Change: frontend-mvp
+
+## Why
+
+The backend MVP now exposes the core tutoring loop, but job seekers still need
+a web service experience instead of API tooling.
+
+## What Changes
+
+- Serve a web app from the Go backend.
+- Add diagnostic practice UI.
+- Add learner progress UI.
+- Add material ingestion, ontology inspection, and teaching asset prompt UI.
+
+## Impact
+
+- Adds frontend capability requirements.
+- Keeps Go backend as the serving boundary for the MVP.
+- Does not introduce authentication, persistence, or real image generation.