feat: add diagnostic web app shell

.planning/phases/007-web-app-shell-diagnostic-start/007-VERIFICATION.md

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+# Phase 7 Verification
+
+## Verdict
+
+PASS
+
+## Requirement Coverage
+
+- WEB-01: PASS. The Go service serves the web app at `/`.
+- WEB-02: PASS. The browser app can create diagnostic sessions through the real
+  backend API.
+- WEB-03: PASS. The browser app can submit answers and render typed rubric
+  feedback, scores, follow-up, and evidence.
+
+## Evidence
+
+- `go test ./...` passed.
+- `openspec validate frontend-mvp --strict` passed.
+- `openspec validate bootstrap-job-tutor-platform --strict` passed.
+- Live root/asset HTTP smoke passed.
+- Live diagnostic create/answer smoke passed through the same server.
+
+## Residual Risk
+
+The UI was verified with HTTP/API smoke but not yet with a browser screenshot
+audit. Phase 8 should add browser-backed checks once the progress view is
+included.