* test: tests for puter.js
* fix: ship lockfile for coverage devDeps; tolerate missing base coverage
npm ci failed on CI because package.json gained the babel/istanbul
devDependencies without the matching package-lock.json update. Also make
the coverage workflow's base leg best-effort so a base ref that predates
the coverage script reports without the comparison column instead of
failing the run.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
