Add verify to extension readme

Author: ismaelJimenez

extensions/README.md

@@ -76,6 +76,7 @@ The following community-contributed extensions are available in [`catalog.commun
 | Retrospective Extension | Post-implementation retrospective with spec adherence scoring, drift analysis, and human-gated spec updates | [spec-kit-retrospective](https://github.com/emi-dm/spec-kit-retrospective) |
 | Spec Sync | Detect and resolve drift between specs and implementation. AI-assisted resolution with human approval | [spec-kit-sync](https://github.com/bgervin/spec-kit-sync) |
 | V-Model Extension Pack | Enforces V-Model paired generation of development specs and test specs with full traceability | [spec-kit-v-model](https://github.com/leocamello/spec-kit-v-model) |
+| Verify Extension | Post-implementation quality gate that validates implemented code against specification artifacts | [spec-kit-verify](https://github.com/ismaelJimenez/spec-kit-verify) |
 
 ## Adding Your Extension