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/repoAccess.ts

@@ -346,6 +346,14 @@ export const REPOSITORY_ACCESS: RepositoryAccess[] = [
       { username: 'jerryhong1', permission: 'push' },
     ],
   },
+  {
+    repository: 'experimental-ext-skills',
+    teams: [
+      { team: 'core-maintainers', permission: 'admin' },
+      { team: 'moderators', permission: 'triage' },
+      { team: 'skills-over-mcp-ig', permission: 'admin' },
+    ],
+  },
 ];
 
 // GitHub Projects V2 permissions are NOT managed by Pulumi - no support yet