fix(cddl2ts): add missing files field to package.json

[dprevost-LMI]

cddl2ts was the only workspace package without a "files" allowlist, so npm/pnpm fell back to gitignore-based inclusion for publishing - and the root .gitignore excludes build/. Every sibling package (cddl, cddl2java, cddl2py, cddl2swift, cddl2kotlin) already has "files": ["build", "bin"]; cddl2ts never did, in its entire release history.

This is the actual cause of cddl2ts@0.11.0 and 0.12.0 publishing without their build/ output - unrelated to the run-p/run-s race fix in #116, which was a real but separate issue. Verified in a clean worktree: with build/ compiled but no files field, pnpm pack --dry-run excluded build/ entirely; adding the field fixes it.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with the required compiled output and CLI files included in the published package.

Summary

Adds an npm publish allowlist to cddl2ts so compiled output and the CLI are included in published packages.

• Publishes the build directory containing the package export.
• Publishes the bin directory containing the CLI launcher.
• Aligns cddl2ts with sibling package publishing conventions.

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