Update root README — checkpoint-28000 logged

README.md

@@ -639,3 +639,14 @@ https://creativecommons.org/licenses/by-nc/4.0/
 **Epoch:** 0.799
 **Zone:** 🎯 Sweet Spot
 **Status:** Training ongoing — auto-uploaded via train_v12.py
+
+---
+
+### 🔵 Checkpoint — Step 28,000
+**Date:** July 02, 2026 at 02:15 IST
+**Checkpoint:** checkpoint-28000
+**Step:** 28,000 / 40,000 (70.0% complete)
+**Loss:** 0.2129
+**Epoch:** 0.818
+**Zone:** 🎯 Sweet Spot
+**Status:** Training ongoing — auto-uploaded via train_v12.py