* fix(plugin-sdk): dedupe declaration dependency types
Keep Zod declarations owned by the published dependency across partitioned SDK declaration builds, and compile an isolated external consumer that mixes the documented runtime and schema entrypoints.
* fix(plugin-sdk): narrow package type regression guard
Keep the cross-entrypoint assignment and exported-schema checks while excluding unrelated declaration-library diagnostics. Inline the temporary consumer and carry the current-main unused-import repair required for green CI.