fix: resolve CLI regressions in wallet send and transactions

Fixed two CLI bugs exposed during training:

1. wallet send - Fixed 'name requests is not defined'
   - Added missing 'import requests' in cli/handlers/wallet.py
   - Command now reaches RPC correctly; failures are blockchain-level

2. wallet transactions - Fixed 'list object has no attribute get'
   - Updated get_transactions in cli/aitbc_cli.py to handle both list and dict responses
   - RPC /rpc/transactions returns a list, CLI expected dict with transactions key
   - Normalizes tx_hash to hash for display

3. Training self-transfer - Skip when wallet has 0 balance
   - Updated scripts/training/stage1_foundation.sh to check wallet balance before self-transfer
   - Avoids retrying guaranteed failures when wallet has no on-chain account

Validation:
- wallet transactions: No longer raises list.get error
- wallet send: Fails correctly at blockchain layer (sender account not found)
- Training script: Skips self-transfer when balance is 0

cli/aitbc_cli.py

@@ -729,7 +729,27 @@ def get_transactions(wallet_name: str, keystore_dir: Path = DEFAULT_KEYSTORE_DIR
         try:
             http_client = AITBCHTTPClient(base_url=rpc_url, timeout=30)
             tx_data = http_client.get(f"/rpc/transactions?address={address}&limit={limit}")
-            return tx_data.get("transactions", [])
+            if isinstance(tx_data, list):
+                transactions = tx_data
+            else:
+                transactions = tx_data.get("transactions", [])
+            wallet_transactions = []
+            for tx in transactions:
+                if not isinstance(tx, dict):
+                    continue
+                payload = tx.get("payload") if isinstance(tx.get("payload"), dict) else {}
+                if (
+                    tx.get("sender") == address
+                    or tx.get("recipient") == address
+                    or payload.get("from") == address
+                    or payload.get("to") == address
+                    or payload.get("recipient") == address
+                ):
+                    normalized_tx = dict(tx)
+                    if "hash" not in normalized_tx and "tx_hash" in normalized_tx:
+                        normalized_tx["hash"] = normalized_tx["tx_hash"]
+                    wallet_transactions.append(normalized_tx)
+            return wallet_transactions
         except NetworkError as e:
             print(f"Error getting transactions: {e}")
             return []

cli/handlers/wallet.py

@@ -1,6 +1,7 @@
 """Wallet command handlers."""
 
 import json
+import requests
 import sys
 from aitbc.paths import get_data_path