Continuous integration failures

[kentcdodds]

Simplify root tsconfig.json and adjust typecheck script to fix CI failures by avoiding project references.

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Note

Low Risk
Build/config-only change; main risk is unintentionally changing which files are included in typechecking by no longer following project references.

Overview
Resolves CI typecheck failures by switching the root typecheck script from tsc -b (project build mode) to tsc -p tsconfig.json.

Simplifies root tsconfig.json by removing files/references and only extends tsconfig.base.json, avoiding multi-project reference builds.

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