Replicate/Mirror SQL Server schema to slave databases
Neither mirroring nor replicaiton are appropiate here. Mirroring creates identical physical copies of the database. Replication is good at replicating data, but falls short exactly at replicating schema changes, so you would use the very wrong tool for the job.

What you describe is a a problem of change control, not replicaiton. You should approach it as such. My favourite approach is described in Version Control and your Database. Brent Ozar PLF's last video also addresses the same problem: Coping with Change Control Video.