docs: drop GitHub Models from roadmap (service retired 2026-07-30)

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Author: AmirhosseinOlyaei

README.md

@@ -130,7 +130,7 @@ Private repos and repos marked `exclude: true` never reach `repos.public.json`.
 
 ## Roadmap
 
-- Optional AI enrichment block (`ai` field per repo: summary, tech stack, highlights) via GitHub Models in the Action
+- Optional AI enrichment block (`ai` field per repo: summary, tech stack, highlights) via a model API in the Action
 - Phase 2 serving: Cloudflare Worker + R2 for `data.devartslab.com`-style endpoints with query filters
 - `repos.featured.json` convenience view