fix: increment adapter_final filename on resume to avoid overwriting previous final

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

nodes/selva_lora_trainer.py

@@ -540,7 +540,13 @@ class SelvaLoraTrainer:
             pbar_train.update(1)
 
         # Save inference adapter (state_dict + meta only — SelvaLoraLoader compatible)
+        # Increment filename if a previous final already exists (resume case)
         final_path = output_dir / "adapter_final.pt"
+        if final_path.exists():
+            i = 1
+            while (output_dir / f"adapter_final_{i:03d}.pt").exists():
+                i += 1
+            final_path = output_dir / f"adapter_final_{i:03d}.pt"
         torch.save({"state_dict": get_lora_state_dict(generator), "meta": meta}, final_path)
         (output_dir / "meta.json").write_text(json.dumps(meta, indent=2))
         print(f"\n[LoRA Trainer] Done. Adapter saved to {final_path}", flush=True)

train_lora.py

@@ -382,7 +382,13 @@ def main():
             print(f"[LoRA] Saved {ckpt_path}")
 
     # Save final adapter with embedded metadata
+    # Increment filename if a previous final already exists (resume case)
     final = output_dir / "adapter_final.pt"
+    if final.exists():
+        i = 1
+        while (output_dir / f"adapter_final_{i:03d}.pt").exists():
+            i += 1
+        final = output_dir / f"adapter_final_{i:03d}.pt"
     meta  = {
         "variant": args.variant,
         "rank":    args.rank,