Remove legacy renderer state import path and client schema

- drop `stateImportLegacyRendererState` handling from server, WS API, and contracts
- remove legacy renderer import tests and old web persistence schema/tests
- rely on current shared state/bootstrap flow instead of one-time legacy import
fda3073e0cJulius Marminge committed on 2/20/2026, 8:22:30 AMparent7214778
13 files changedLine totals unavailable