Migrating four namespaces to Pydantic DTO boundaries

Four namespaces have been migrated to the Pydantic DTO boundary in a coordinated push: voice_settings, wrappers, mcp_clients, and moments. Each commit applies the same architectural pattern, introducing Pydantic-based data transfer objects to formalize the interface contracts at the boundary of these subsystems.

The voice_settings migration lands first, establishing the pattern for serializing and validating settings payloads via DTOs rather than ad-hoc structures. The wrappers namespace follows, applying the same boundary treatment to the layer that envelops external or internal integrations.

Next, the mcp_clients namespace gets the DTO boundary treatment, standardizing how client configuration and state flow across the MCP integration surface. The moments namespace closes out the batch, bringing Pydantic validation to that subsystem as well.

Together, these commits signal a deliberate, systematic effort to consolidate boundary handling on Pydantic DTOs across the codebase, with each migration co-authored by Claude Opus 4.8.

• voice_settings namespace migrated to Pydantic DTO boundary

• wrappers namespace migrated to Pydantic DTO boundary

• mcp_clients namespace migrated to Pydantic DTO boundary

• moments namespace migrated to Pydantic DTO boundary

• All four migrations co-authored by Claude Opus 4.8

• Pattern suggests a broader, systematic DTO-boundary consolidation effort