Type checks only need Host declarations and Typert-generated
declarations, but typecheck, lint, lint:fix, doc-typecheck, and the CI
typert-contracts gate rebuilt the whole Host tsdown pass, Desktop bundle
included, to obtain them. A source-only scripts/generate-typert.ts now
runs the same generator and artifact writer as the tsdown plugin, beside
Host package compilation: Typert reads only sources once the missing
@deepseek-ai/dsh-client-file-upload/types path alias exists, and
rejectBuildOutputs fails the pass when a workspace lib/ declaration
enters its program. typecheck runs as a build.ts scope that checks both
aggregates in build mode after their own face compiles.
Refs #5852
Tianyi Cui