Update csharp-sdk repo access to use team assignments (#76)

* Add csharp-sdk-admin team and split csharp-sdk repo permissions

Introduce a csharp-sdk-admin team for admin access to the csharp-sdk repo,
while the existing csharp-sdk team is changed to push (write) access. This
separates admin privileges from general write access.

- Add CSHARP_SDK_ADMIN role to roleIds.ts and roles.ts
- Update repoAccess.ts: csharp-sdk-admin (admin), csharp-sdk (push), PederHP (triage)
- Add jeffhandley, ericstj, jozkee, tarekgh as new members in users.ts
- Move dend/localden from csharp-sdk to csharp-sdk-admin team
- Add csharp-sdk-admin membership for halter73, mikekistler, stephentoub
- Remove MackinnonBuck (admin) direct access per request

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Fix alphabetical ordering of new users in users.ts

Move ericstj after erain and jeffhandley before jenn-newton to satisfy
the case-insensitive alphabetical sort check in validate-config.ts.

🏠 Remote-Dev: homespace

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Den Delimarsky <den@anthropic.com>

src/config/roles.ts

@@ -160,6 +160,12 @@ export const ROLES: readonly Role[] = [
     github: { team: 'csharp-sdk', parent: ROLE_IDS.SDK_MAINTAINERS },
     discord: { role: 'c# sdk maintainers (synced)' },
   },
+  {
+    id: ROLE_IDS.CSHARP_SDK_ADMIN,
+    description: 'C# SDK repository admins',
+    github: { team: 'csharp-sdk-admin', parent: ROLE_IDS.CSHARP_SDK },
+    // GitHub only - for repo admin access
+  },
   {
     id: ROLE_IDS.GO_SDK,
     description: 'The Go SDK Team',