Goatcoin: v1.000 added

[jtxaeth]

New family submission: Goatcoin (Regular, OFL)

Goatcoin is an ultra-heavy uppercase display typeface built as a strict parametric system — every glyph is generated by Python scripts from a small set of values, published in full in the upstream repo.

• Upstream: https://github.com/jtxaeth/goatcoin-font (sources: UFO + build scripts + parameter files; fonts rebuild with python sources/build.py)
• Designer: jtxaeth (catalog entry included in this PR)
• License: SIL OFL 1.1, no Reserved Font Name
• Coverage: Google Fonts Latin Core (pan-European Latin incl. Polish, Czech, Turkish, Romanian, Hungarian, Baltic), combining marks with GPOS attachment
• Features: proportional figures default / tnum tabular, slashed zero default / ss02 plain, lowercase-to-caps cmap
• QA: fontbakery check-googlefonts — 0 ERROR / 0 FATAL / 0 FAIL (remaining WARNs reviewed and accepted: contour-count and short-segment design flags, unregistered vendor ID, subset-definition notes)

This PR adds ofl/goatcoin/ (METADATA.pb, DESCRIPTION.en_us.html, Goatcoin-Regular.ttf) and catalog/designers/jtxaeth/ (info.pb, bio.html).

🤖 Generated with Claude Code

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[jtxaeth]

Closing in favour of the documented submission process — filed as the Add Font issue: #10748. Upstream repo: https://github.com/jtxaeth/goatcoin-font