docs: start frontend mvp milestone

.planning/STATE.md

@@ -7,7 +7,7 @@ See: `.planning/PROJECT.md` (updated 2026-04-26)
 **Core value:** The user should feel and prove that they are becoming more
 interview-ready after each short practice loop.
 
-**Current focus:** v1 milestone audited; ready to choose the next milestone.
+**Current focus:** v2 Frontend MVP milestone started; ready for Phase 7.
 
 ## Current Decisions
 
@@ -35,11 +35,12 @@ interview-ready after each short practice loop.
   evidence, model config, review state, and model-id verification guard.
 - v1 milestone audit completed with all 28/28 requirements satisfied and
   tech-debt items recorded in `.planning/v1-MILESTONE-AUDIT.md`.
+- v2 Frontend MVP milestone selected to turn the backend learning loop into a
+  usable web service.
 
 ## Next Actions
 
-1. Choose the next milestone: frontend MVP, persistence, real workflow runtime,
-   or document parser integration.
+1. Plan and execute Phase 7: Web App Shell and Diagnostic Start.
 2. Verify the production OpenAI image model identifier before real image
    generation calls.
 3. Add standardized SUMMARY frontmatter or Nyquist validation files if future
@@ -73,6 +74,8 @@ interview-ready after each short practice loop.
   integration, E2E diagnostic/progression and material/asset flows. Audit
   status is `tech_debt` because MVP storage, real workflow runtime, parsers,
   real image generation, and Nyquist validation artifacts remain deferred.
+- 2026-04-26: v2 Frontend MVP milestone started with WEB-01..WEB-08 mapped to
+  phases 7 through 9.
 
 ---
 *State initialized: 2026-04-26.*