refactor: clean up tests/ root — delete junk, sort into subdirs

Deleted (7 files):
- test_discovery.py, test_windsurf_integration.py (trivial assert True stubs)
- pytest_simple.ini (unused --collect-only config)
- conftest_path.py (duplicate of conftest.py path setup)
- conftest_fixtures.py, conftest_full.py (unused conftest variants)

Moved to integration/ (6 files):
- test_blockchain_final.py, test_blockchain_nodes.py, test_blockchain_simple.py
- test_basic_integration.py, test_integration_simple.py, test_working_integration.py

Moved to fixtures/:
- mock_blockchain_node.py

tests/ root now has only conftest.py and README.md.

tests/integration/test_blockchain_simple.py

@@ -0,0 +1,98 @@
+#!/usr/bin/env python3
+"""
+Simple test to verify blockchain nodes are working independently
+and demonstrate how to configure them for networking
+"""
+
+import httpx
+import json
+import time
+
+# Node URLs
+NODES = {
+    "node1": "http://127.0.0.1:8082",
+    "node2": "http://127.0.0.1:8081",
+}
+
+def test_node_basic_functionality():
+    """Test basic functionality of each node"""
+    print("Testing Blockchain Node Functionality")
+    print("=" * 60)
+    
+    for name, url in NODES.items():
+        print(f"\nTesting {name}:")
+        
+        # Check if node is responsive
+        try:
+            response = httpx.get(f"{url}/openapi.json", timeout=5)
+            print(f"  ✅ Node responsive")
+        except:
+            print(f"  ❌ Node not responding")
+            continue
+        
+        # Get chain head
+        try:
+            response = httpx.get(f"{url}/rpc/head", timeout=5)
+            if response.status_code == 200:
+                head = response.json()
+                print(f"  ✅ Chain height: {head.get('height', 'unknown')}")
+            else:
+                print(f"  ❌ Failed to get chain head")
+        except:
+            print(f"  ❌ Error getting chain head")
+        
+        # Test faucet
+        try:
+            response = httpx.post(
+                f"{url}/rpc/admin/mintFaucet",
+                json={"address": "aitbc1test000000000000000000000000000000000000", "amount": 100},
+                timeout=5
+            )
+            if response.status_code == 200:
+                print(f"  ✅ Faucet working")
+            else:
+                print(f"  ❌ Faucet failed: {response.status_code}")
+        except:
+            print(f"  ❌ Error testing faucet")
+
+def show_networking_config():
+    """Show how to configure nodes for networking"""
+    print("\n\nNetworking Configuration")
+    print("=" * 60)
+    
+    print("""
+To connect the blockchain nodes in a network, you need to:
+
+1. Use a shared gossip backend (Redis or Starlette Broadcast):
+
+   For Starlette Broadcast (simpler):
+   - Node 1 .env:
+     GOSSIP_BACKEND=broadcast
+     GOSSIP_BROADCAST_URL=http://127.0.0.1:7070/gossip
+     
+   - Node 2 .env:
+     GOSSIP_BACKEND=broadcast
+     GOSSIP_BROADCAST_URL=http://127.0.0.1:7070/gossip
+
+2. Start a gossip relay service:
+   python -m aitbc_chain.gossip.relay --port 7070
+
+3. Configure P2P discovery:
+   - Add peer list to configuration
+   - Ensure ports are accessible between nodes
+
+4. For production deployment:
+   - Use Redis as gossip backend
+   - Configure proper network addresses
+   - Set up peer discovery mechanism
+
+Current status: Nodes are running independently with memory backend.
+They work correctly but don't share blocks or transactions.
+""")
+
+def main():
+    test_node_basic_functionality()
+    show_networking_config()
+
+if __name__ == "__main__":
+    main()