* feat(skills): add beginner-seo-audit agent skill
A portable agent skill that audits a domain with OpenSEO and delivers a
one-page, plain-language HTML report for a non-SEO owner, centered on a
single do-this-week action. Ships with a frozen report template and a
docs page under Agent Skills.
* feat(skills): add starting-focus keyword step; cross-link from coach and project setup
- beginner-seo-audit now proposes a 'Where to focus first' area on healthy
sites: one research_keywords call, one theme, 3-5 winnable keywords with
what to make for each. Skipped entirely when the site is down.
- seo-coach and seo-project-setup now recommend beginner-seo-audit as the
first workflow for a beginner with an existing site.
- Docs pages updated to match.
* refactor(skills): rename beginner-seo-audit to seo-audit
Audience-neutral name; the plain-language, one-action framing moves to
the description. Docs slug, meta.json, and coach/project-setup
cross-references updated to match.
