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
1edb351f01Julius Marminge committed on 8/29/2026, 6:00:22 AM· committed by Julius Marmingeparentf7f7ce8
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