SDA Primaries Accumulation

Building a comprehensive corpus of SDA doctrinal materials on the Sabbath, including EGW, Belief #20, sermons, and short-form polemics from @3AngelsWatchman. Recent additions include Uriah Smith's 'Daniel and Revelation' and 4 new tweets reinforcing investigative judgment and Sunday as mark of beast. Discarded 14 irrelevant/duplicate articles this batch.