feat(link): forward skip-validation from the link shortcode to the partial

[markdumay]

Summary

The assets/link.html partial has supported skip-validation since v2.0.0 (per data/structures/link.yml), but the {{< link >}} shortcode never forwarded it — so authors could not skip internal-link validation from markdown. This exposes the existing capability on the shortcode.

• layouts/_shortcodes/link.html — forward "skip-validation" (index $args "skip-validation") into the assets/link.html partial call (hyphenated key read via index).
• data/structures/link.yml — drop group: partial on skip-validation so the argument is recognized and auto-documented for the shortcode as well as the partial.

Use case: linking to build-time-dynamic targets (e.g. content-adapter / module-mounted pages that may be absent in a given build) without tripping the fatal internal-link validator.

Behavior

Backward compatible — skip-validation defaults to falsy, so omitting it leaves link behavior (and validation) unchanged.

Test

Verified against the exampleSite (internalLinks.validate = true, where an unresolved internal link is a fatal errorf) using a transient probe page linking to a non-existent internal path:

Case	Cannot find page or asset errors
{{< link skip-validation=true >}} before the change	2 (not forwarded)
{{< link skip-validation=true >}} after the change	0 (skipped)
{{< link >}} (no arg) after the change	2 (default validation intact)

npm run lint:markdown passes; the probe page was removed before commit.

🤖 Generated with Claude Code

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🎉 This PR is included in version 2.13.0 🎉

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