- BulkSiteService creates Team sites via TeamSiteCollectionCreationInformation with owners/members
- BulkSiteService creates Communication sites via CommunicationSiteCollectionCreationInformation with generated URL
- Per-site error handling via BulkOperationRunner with continue-on-error semantics
- SanitizeAlias generates URL-safe aliases from site names for Communication sites
- BulkSiteServiceTests: 3 pass (interface check + model defaults + CSV parsing), 3 skip (live SP)
- Fixed pre-existing BulkMemberService.cs Group type ambiguity (MSCSC.Group vs Graph.Models.Group)
