feat: add ai-seo skill for AI search optimization (AEO, GEO, LLMO)

Split AEO/GEO content patterns out of seo-audit into a standalone ai-seo
skill. Covers AI visibility auditing, content extractability, authority
signals, third-party presence strategy, schema markup for AI, monitoring
tools (Otterly, Peec AI, ZipTie), and optimization by content type.

Moves aeo-geo-patterns.md from seo-audit/references to ai-seo/references
(renamed to content-patterns.md). Updates seo-audit to cross-reference
the new skill.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -19,6 +19,7 @@ Skills are markdown files that give AI agents specialized knowledge and workflow
 |-------|-------------|
 | [ab-test-setup](skills/ab-test-setup/) | When the user wants to plan, design, or implement an A/B test or experiment. Also use when the user mentions "A/B... |
 | [ad-creative](skills/ad-creative/) | When the user wants to generate, iterate, or scale ad creative — headlines, descriptions, primary text, or full ad... |
+| [ai-seo](skills/ai-seo/) | When the user wants to optimize content for AI search engines, get cited by LLMs, or appear in AI-generated answers... |
 | [analytics-tracking](skills/analytics-tracking/) | When the user wants to set up, improve, or audit analytics tracking and measurement. Also use when the user mentions... |
 | [cold-email](skills/cold-email/) | Write B2B cold emails and follow-up sequences that get replies. Use when the user wants to write cold outreach emails,... |
 | [competitor-alternatives](skills/competitor-alternatives/) | When the user wants to create competitor comparison or alternative pages for SEO and sales enablement. Also use when... |
@@ -162,6 +163,7 @@ You can also invoke skills directly:
 
 ### SEO & Discovery
 - `seo-audit` - Technical and on-page SEO
+- `ai-seo` - AI search optimization (AEO, GEO, LLMO)
 - `programmatic-seo` - Scaled page generation
 - `competitor-alternatives` - Comparison and alternative pages
 - `schema-markup` - Structured data