Split the V2 frontend plan into parity and enrichment phases

- Define Shape 4.0 for the client cutover and product parity
- Define Shape 4.5 for V2-native UI capabilities
- Defer existing V1 state migration to an out-of-scope Stage 5
afd884aa42Julius Marminge committed on 9/5/2026, 4:54:18 AM· committed by Julius Marmingeparent1146469
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