On Thursday, Riptide finds Roosevelt Ivory, Sr. stepping out of a white Lincoln Navigator, accompanied by an apparent bodyguard, at his two-house compound on Northwest 69th Terrace in Liberty City. It's advertised as "Roosevelt's Rooming House" in the White Pages, but this certainly is no Days Inn. A burly, dreadlocked guard sits in front of a heavy metal front door, and all of the windows are grated and sealed. The 6-foot-4-or-so Ivory, who's 63 but looks ten years younger, wears a red shirt th