Update root README — checkpoint-6739 logged

README.md

@@ -188,3 +188,14 @@ https://creativecommons.org/licenses/by-nc/4.0/
 **Epoch:** 0.185
 **Zone:** 📈 Good
 **Status:** Training ongoing — auto-uploaded via train_v12.py
+
+---
+
+### 🔵 Checkpoint — Step 6,739
+**Date:** June 24, 2026 at 23:37 IST
+**Checkpoint:** checkpoint-6739
+**Step:** 6,739 / 40,000 (16.8% complete)
+**Loss:** 0.1934
+**Epoch:** 0.197
+**Zone:** 🎯 Sweet Spot
+**Status:** Training ongoing — auto-uploaded via train_v12.py