SATURDAY'S RACING INSIGHTS: By Christie DeBernardis Sponsored by Alex Nichols Agency WELL-BRED CURLIN COLT DEBUTS IN NY 6th-BEL, $63K, Msw, 2yo, 1m, 3:36 p.m. St. Elias Stable homebred KNOWN AGENDA (Curlin) makes his career bow in this spot for Todd Pletcher. The chestnut is out of GISW Byrama (GB) (Byron {GB}), who is a half-sister to GSW Klammer (GB) (Exceed and Excel {Aus}). He enters off a pair of bullet works, most recently covering a half-mile in a best-of-29 :48 2/5 on Saratoga's Oklahoma training track Sept. 14. His entry-mate...