fix: import parquetDataSource from the built package

[severo]

fix #378

[severo]

Note that I adapted the "typecheck" script because the files in bin/ require the lib and the types to be built, now that they depend on hyperparam.

[Copilot]

Pull request overview

Fixes the reported install/runtime issue (#378) by ensuring the CLI tool imports parquetDataSource from the published package surface rather than from source files that aren’t present in the built artifact.

Changes:

• Update bin/tools/parquetSql.js to import parquetDataSource from hyperparam instead of ../../src/index.js.
• Update npm run typecheck to build before running tsc --noEmit (and add typecheck-once-built).

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Adjusts typechecking scripts to ensure built type artifacts exist before tsc --noEmit.
bin/tools/parquetSql.js	Switches parquetDataSource import to come from the published package entrypoint.

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