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In-house gems have nowhere to publish: gems locals only take raw file uploads, which `gem push`, `gem install` and bundler cannot use. - accept `gem push` (`POST <repo>/api/v1/gems`, 256MiB cap, 8MiB metadata cap) and `gem yank` (`DELETE <repo>/api/v1/gems/yank`); any API key works - parse the gemspec from the `.gem`; reject an existing name-version-platform with 409 - serve the compact index (`versions`, `info/<gem>`, `names`), `.gem` files and generated `quick/Marshal.4.8` specs; no legacy `specs.4.8.gz` - route HEAD on locals (gem probes `versions` with HEAD) - add `docs/gems/local.md`, a UI snippet and a stock `ruby:3.3` e2e-docker case Reviewed-on: #153 Co-authored-by: unkin-agent <unkin-agent@unkin.net> Co-committed-by: unkin-agent <unkin-agent@unkin.net>