Update root README — checkpoint-13000 logged

README.md

@@ -331,3 +331,14 @@ https://creativecommons.org/licenses/by-nc/4.0/
 **Epoch:** 0.374
 **Zone:** 🎯 Sweet Spot
 **Status:** Training ongoing — auto-uploaded via train_v12.py
+
+---
+
+### 🔵 Checkpoint — Step 13,000
+**Date:** June 26, 2026 at 22:14 IST
+**Checkpoint:** checkpoint-13000
+**Step:** 13,000 / 40,000 (32.5% complete)
+**Loss:** 0.2178
+**Epoch:** 0.380
+**Zone:** 🎯 Sweet Spot
+**Status:** Training ongoing — auto-uploaded via train_v12.py