Ship TypeScript sources in releases

[SandroMaglione]

Summary

• include every original src/**/*.ts file in the published package, matching Effect's release layout
• keep runtime and type exports pointed at the compiled dist output
• make the pack check verify every source file is present in the release archive
• add a patch changeset

Changeset

• Added or updated for a library or package-metadata change
• Not required because this PR does not change src/ or package.json

Validation

• pnpm check
• Relevant example checks, when examples changed (not applicable)
• Automated type-performance measurement passed or was not required
• Automated runtime- and memory-performance measurement passed or was not required

The release tarball contains all 37 TypeScript source files and passes pnpm pack:check with 194 packaged files.