refactor: improve gossip broker cleanup and enhance CLI wallet transaction handling

- Refactor _InProcessBroadcast.subscribe to use asynccontextmanager for cleaner resource cleanup
- Remove manual release callback in _InProcessSubscriber
- Update file-based wallet send to submit transactions via blockchain RPC
- Fetch balance and nonce from chain before sending transactions
- Add tx_hash and status tracking to local transaction history
- Enhance run_subprocess to support additional kwargs and return Comp

apps/blockchain-node/fix_tx_metadata2.py

@@ -0,0 +1,50 @@
+import sqlite3
+
+def fix_db():
+    print("Fixing transaction table on aitbc node...")
+    
+    conn = sqlite3.connect('/opt/aitbc/data/ait-mainnet/chain.db')
+    cursor = conn.cursor()
+    
+    try:
+        cursor.execute('ALTER TABLE "transaction" ADD COLUMN nonce INTEGER DEFAULT 0;')
+        print("Added nonce column")
+    except sqlite3.OperationalError as e:
+        print(f"Error adding nonce: {e}")
+        
+    try:
+        cursor.execute('ALTER TABLE "transaction" ADD COLUMN value INTEGER DEFAULT 0;')
+        print("Added value column")
+    except sqlite3.OperationalError as e:
+        print(f"Error adding value: {e}")
+        
+    try:
+        cursor.execute('ALTER TABLE "transaction" ADD COLUMN fee INTEGER DEFAULT 0;')
+        print("Added fee column")
+    except sqlite3.OperationalError as e:
+        print(f"Error adding fee: {e}")
+        
+    try:
+        cursor.execute('ALTER TABLE "transaction" ADD COLUMN status TEXT DEFAULT "pending";')
+        print("Added status column")
+    except sqlite3.OperationalError as e:
+        print(f"Error adding status: {e}")
+        
+    try:
+        cursor.execute('ALTER TABLE "transaction" ADD COLUMN tx_metadata TEXT;')
+        print("Added tx_metadata column")
+    except sqlite3.OperationalError as e:
+        print(f"Error adding tx_metadata: {e}")
+        
+    try:
+        cursor.execute('ALTER TABLE "transaction" ADD COLUMN timestamp TEXT;')
+        print("Added timestamp column")
+    except sqlite3.OperationalError as e:
+        print(f"Error adding timestamp: {e}")
+        
+    conn.commit()
+    conn.close()
+    print("Done fixing transaction table.")
+
+if __name__ == '__main__':
+    fix_db()