fe940c95

By: Michael Lynch <git@mtlynch.io>

Add infallible RelativeOutputPath constructor from Filename

A Filename is already validated, so converting one into a
RelativeOutputPath cannot fail. Add NewRelativeOutputPathFromFilename
and drop pathFor's error return in the importer, removing dead error
handling at every call site.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
configuredevShellbackendbackend-devcheck-bashcheck-frontendcheck-go-formattingcheck-go-test-packagescheck-trailing-newlinecheck-trailing-whitespacediagrame2e-testsgo-testsimport-from-tinybeanslint-sqllittle-momentslittle-moments-devx86_64-linux