skills: add SEO/AEO audit and grounded-JSON-LD skills from citeworthyio/seo-agent

Evaluated citeworthyio/seo-agent for reusable process knowledge. Relevant
to this fleet's WordPress content sites (granja travel news, content-agent
pipeline): a crawl-diagnose-approve-recrawl-measure loop for SEO metadata
changes, a three-layer AI-crawler accessibility audit (robots policy, bot
delivery, readable content), and a fail-closed method for generating and
safely injecting Article JSON-LD. Keyword research and citation-probe
pieces of the source repo were skipped as underdeveloped or too
infra-coupled to be reusable here.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

README.md

@@ -100,6 +100,15 @@ than assuming the delegate can fetch it itself.
 - `finishing-development-branches` -- verify the exact branch tip, confirm
   its base, and require an explicit integration choice before merge, Gitea
   push/PR, or cleanup.
+- `seo-change-lifecycle` -- audit the metadata crawlers actually receive, move
+  fixes through approval and recrawl verification, then evaluate delayed
+  page-level Search Console signals without claiming causation.
+- `ai-crawler-accessibility-audit` -- distinguish answer-engine bots from
+  training crawlers, detect robots/CDN blocks and misleading llms.txt soft
+  404s, and verify that non-JS fetchers receive readable page content.
+- `grounded-article-jsonld` -- generate Article structured data only from
+  observed page facts, validate it at every boundary, and serialize it safely
+  for additive script injection.
 
 ## Provenance
 
@@ -115,6 +124,7 @@ each skill's frontmatter:
 - [Leonxlnx/taste-skill](https://github.com/Leonxlnx/taste-skill) (MIT)
 - [JuliusBrussee/caveman](https://github.com/JuliusBrussee/caveman) (MIT;
   evaluated, no skill retained)
+- [citeworthyio/seo-agent](https://github.com/citeworthyio/seo-agent) (MIT)
 
 ## Vetting external skills