blog: add feature blog for Grok Build harness

[omnigent-ci]

Drafts a feature-blog post for add feature blog for Grok Build harness, selected by feature-blog-scout at the v0.9.0 release cut.

This is a DRAFT. Before merging, a human must: record the mandatory demo (replace the DEMO REQUIRED marker) and do a final voice pass. The hero image and author: omnigent byline are auto-generated — review and optionally replace them.

Post drafted

• app/blog/grok-build-first-class-harness/page.mdx

Manual review needed

• Demo asset — the post carries a {/* DEMO REQUIRED */} marker; record a 15–30s clip or light/dark screenshot pair of picking Grok Build in the harness picker and running one turn.
• Hero image — heroArt is left empty and auto-generated from IMAGE_PROMPT; review / optionally replace.
• Author byline — defaults to omnigent; review / optionally replace during editing.
• CLI harness flag — the material grounds the harness id grok (alias grok-build) via the ACP catalog, so I used omni run --harness grok; confirm the exact omni run invocation against the shipped CLI if you want to be certain.

Source PRs — demo videos

Check a ✅ PR for a recording you can drop into the DEMO REQUIRED marker.

PR	Title	Demo video?
#3075	feat(harness): add Grok Build (xAI) as a first-class ACP harness	—

Source release: v0.9.0 · most context @dhruv0811
_{Generated by omnigent .github/workflows/feature-blog.yml. Review for accuracy before merging.}

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