Run package typecheck against build config

[Peter7896]

Summary

• point package-level npm run typecheck at tsconfig.build.json
• reuse the existing build config that already excludes example and example-new-architecture
• keep the root tsconfig.json unchanged while avoiding example app dependency failures during package typecheck

Validation

• npm install --ignore-scripts --no-audit --no-fund --legacy-peer-deps
• npm run typecheck

Fixes #33.

[gemini-code-assist]

Code Review

This pull request updates tsconfig.json to exclude the example and example-new-architecture directories. The reviewer notes that this disables TypeScript type-checking and IntelliSense for these folders in IDEs and introduces redundancy with tsconfig.build.json. They suggest updating the typecheck script in package.json to use tsconfig.build.json instead.

[Peter7896]

Updated the branch to keep the root tsconfig.json unchanged and point the package typecheck script at tsconfig.build.json, which already carries the example app excludes.

npm run typecheck passes with this version.