docs: remove backward compatibility framing from architecture specs

docs/architecture/forward-look.md

@@ -156,14 +156,14 @@ const drizzleTable = root.ctx.tables.graph_types;
 ### v1 approach
 
 For v1, storage continues with manual Drizzle table definitions. The dbtype
-integration is a post-v1 migration path because:
+integration is deferred because:
 
 - dbtype is Phase 0 (architecture complete, no implementation)
 - The manual defs work and are well-understood
 - The Module pattern for graph types can be adopted independently (no dbtype
   dependency)
 
-When dbtype reaches Phase 1 (implementation), storage can migrate table defs
+When dbtype reaches Phase 1 (implementation), storage can adopt dbtype element
 to dbtype elements one table at a time. The Module-based graph type definitions
 are already compatible — they're both TypeBox `Type.Module` objects.