Add paper links and citation blocks to Every Eval Ever and Evaluation Cards

[borgr]

Both flagship Infrastructure projects now have arXiv papers, but the site didn't consistently surface them and neither landing page told a reader how to cite the work.

	Paper	Linked on its project page before?	Cite block?
Evaluation Cards	arXiv:2606.09809	Yes — nav + hero	No
Every Eval Ever	arXiv:2606.14516	No — nothing, anywhere	No

Changes

New _includes/cite.html — a "Cite this work" band above the footer: reference line, arXiv BibTeX, copy button, on the muted background. Driven entirely by project front matter and wrapped in {% if page.bibtex %}, so it renders nothing on projects without a paper. Styled with the layouts' design tokens (each with a light-mode fallback, since the tokens aren't defined site-wide) so it works in light and dark on both custom layouts and on the generic project.html. Wired into all three layouts, which means bench-sat can get a cite block later from front matter alone.

Every Eval Ever paper links — mirrors what Evaluation Cards already does, in two understated places: a Paper item in the nav beside Dataset and GitHub, and the accent line below the hero buttons rather than competing with them. Evaluation Cards already had both, so it only gains the cite band.

_posts/2026-02-17-everyevalever-launch.md — the post cited itself as a blog post (note = {Blog Post, EvalEval Coalition}). Now that the paper exists, it cites the paper. The Evaluation Cards post already had the paper entry and is unchanged.

Verification

• Jekyll 4.3.4 build exits 0, no Liquid warnings.
• Both BibTeX entries match the canonical arxiv.org/bibtex exports byte-for-byte after entity decoding — braces balanced, Šuppa intact.
• Rendered both pages in light and dark: band background, heading, body text, <pre> and accent links all legible against each layout's own tokens.
• Copy button exercised in a real browser on both code paths: the execCommand fallback copies exactly pre.textContent (1204 chars, identical) and cleans up its temp textarea; the Clipboard API path degrades to a "Press ⌘C" hint rather than failing silently.
• /projects/bench-sat/ still renders, confirming the include is inert without front matter.

Noted, not fixed

Both project pages already overflow horizontally at 390px on master — the community-section buttons and footer clip identically with and without this branch, so it predates these changes. Worth a separate fix.