add build development phases

dev/shared-working-context/frontend/STATUS.md

@@ -0,0 +1,15 @@
+# Frontend status log (append-only)
+
+One block per completed frontend phase. Newest at the top. Frontend lane writes here; backend reads
+for awareness.
+
+<!-- TEMPLATE — copy for each phase
+## frontend-phase-N-bM — <Title> — <YYYY-MM-DD>
+- **Shipped:** <screens/flows/services/hooks/components in one or two lines>
+- **Consumes:** dev/contracts/domains/<domain>.md (backend phase bM)
+- **Mocked client-side:** <which services are mocked pending which backend phase>
+- **Gate:** npm run check green / tests green
+- **Requests filed:** frontend/requests/for-backend.md (yes/no)
+-->
+
+_(no phases completed yet)_