chore: upgrade TypeScript to 6.0.2

[chenjiahan]

Summary

• Upgrade TypeScript to ^6.0.2.
• Replace the root tsconfig.json with the shared NodeNext configuration.
• Validate the change with pnpm build and pnpm test.

Related Links

• https://github.com/microsoft/TypeScript/releases/tag/v6.0.2

[Copilot]

Pull request overview

This PR upgrades the repo’s TypeScript toolchain to v6.0.2 and adjusts the root TypeScript compiler configuration to use NodeNext-style module settings for the library build.

Changes:

• Bump typescript from ^5.9.3 to ^6.0.2 (and update lockfile).
• Update root tsconfig.json (target, module/moduleResolution, add rootDir and types).
• Minor package.json formatting change for the files field.

Reviewed changes

Copilot reviewed 1 out of 3 changed files in this pull request and generated no comments.

File	Description
tsconfig.json	Updates compiler options for NodeNext module settings and newer target.
package.json	Updates TypeScript devDependency version and reformats files array.
pnpm-lock.yaml	Lockfile updates reflecting TypeScript 6.0.2 and dependent graph changes.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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