Add TestReserveSlot_DoesNotSelfBlock, TestAdminReserveSlot_DoesNotSelfBlock and TestReserveSlot_CleansUpAnonReservation. Add UserIDKey context to admin approve edit request tests. Remove weekend-day adjustment in TestAdminApproveEditRequest_OverlapWithBooking_Regression and TestAdminApproveEditRequest_EvictsPendingRelease (no longer needed). Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>