Summary

• Fix build crash when a workspace dep can't be resolved by rolldown (e.g. missing exports/main). The plugin was adding a bogus path like join(workPath, '@repo/pkg') to localBuildFiles, causing NFT to crash with File .../@repo/pkg does not exist.
• Fix isTypeScriptFile in NFT to exclude .d.ts files, aligning with the cervel implementation
• Expand monorepo workspace dep test coverage with new fixture packages (@repo/ts-utils with exports field, @repo/shared-types with types + values) and files.json assertions

Test plan

• Regression test: does not crash when a workspace dep cannot be resolved — injects an unresolvable bare import and asserts build completes
• Fixture 17 now asserts workspace dep transpiled files are in the lambda (files.json)
• Full test suite passes (27 tests)

🤖 Generated with Claude Code