Add Skills Over MCP Interest Group role and users (#56)

* Add Skills Over MCP Interest Group and experimental-ext-skills repo

- Add SKILLS_OVER_MCP_IG role under interest-groups (GitHub team only)
- Add repo access for experimental-ext-skills per SEP-2133 governance:
  - core-maintainers: admin (oversight)
  - moderators: triage
  - skills-over-mcp-ig: admin (day-to-day governance)
- Add IG membership for: cliffhall, erain, JAORMX, kaxil, keithagroves,
  olaservo, pederhp, SamMorrowDrums, TeamSparkAI

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Add SKILLS_OVER_MCP_IG role to user membership

* Fix alphabetical sorting of users

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
Co-authored-by: Paul Carleton <paulcarletonjr@gmail.com>

src/config/roleIds.ts

@@ -61,6 +61,7 @@ export const ROLE_IDS = {
   CLIENT_IMPLEMENTOR_IG: 'client-implementor-ig',
   FINANCIAL_SERVICES_IG: 'financial-services-ig',
   GATEWAYS_IG: 'gateways-ig',
+  SKILLS_OVER_MCP_IG: 'skills-over-mcp-ig',
 
   // ===================
   // WG/IG Facilitators (Discord only)