--- /dev/null
+**Model**: Claude Opus 4.6
+
+# Yeseva One — Upstream Source Investigation
+
+## Summary
+
+The upstream source repository for Yeseva One was identified and a source block was added to `METADATA.pb`.
+
+## Repository
+
+- **URL**: https://github.com/alexeiva/yesevaone
+- **Owner**: Alexei Vanyashin (alexeiva)
+- **Designer**: Jovanny Lemonad
+- **Source format**: Glyphs (`YesevaOne.glyphs`)
+- **Branch**: master
+- **Commit**: `0d609f6155ed0fe1d822696135ffbd04b88fd017`
+- **Commit date**: 2016-12-13
+- **Commit message**: "Merge pull request #2 from m4rc1e/master — Updated copyright string"
+
+## Investigation Notes
+
+The repository was found at `alexeiva/yesevaone` by searching for "Jovanny Lemonad font" on GitHub. The repository description stated "open-source font by Jovanny Lemonad". The `sources/` directory contained a single `YesevaOne.glyphs` file. The repository is not a fork and was last updated in June 2023. Alexei Vanyashin (alexeiva) appears to be the maintainer who hosted the upstream source on behalf of the original designer Jovanny Lemonad.
+
+## Confidence
+
+High — the repository description explicitly credits Jovanny Lemonad as the font designer, and the Glyphs source matches the expected single-weight display font.