Update root README — checkpoint-538 logged

README.md

@@ -78,3 +78,14 @@ https://creativecommons.org/licenses/by-nc/4.0/
 **Epoch:** 0.001
 **Zone:** 📚 Learning
 **Status:** Training ongoing — auto-uploaded via train_v12.py
+
+---
+
+### 🔵 Checkpoint — Step 538
+**Date:** June 22, 2026 at 23:38 IST
+**Checkpoint:** checkpoint-538
+**Step:** 538 / 40,000 (1.3% complete)
+**Loss:** 0.4087
+**Epoch:** 0.015
+**Zone:** 📈 Good
+**Status:** Training ongoing — auto-uploaded via train_v12.py