fix: update blockchain block command to use local node RPC endpoints with fallback search, revert client job submission to /v1/jobs, and document Concrete ML Python 3.13 compatibility limitation

- Change blockchain block command to query local node at /rpc/blocks/by_hash/{hash} instead of coordinator
- Add fallback to /rpc/blocks/{height} for numeric block identifiers
- Implement block hash search across recent blocks (last 10) when direct lookup fails
- Revert client job submission endpoint from

scripts/generate-api-keys.py

@@ -0,0 +1,109 @@
+#!/usr/bin/env python3
+"""
+API Key Generation Script for AITBC CLI
+
+Generates cryptographically secure API keys for testing CLI commands
+"""
+
+import secrets
+import json
+import sys
+from datetime import datetime, timedelta
+
+def generate_api_key(length=32):
+    """Generate a cryptographically secure API key"""
+    return secrets.token_urlsafe(length)
+
+def create_api_key_entry(name, permissions="client", environment="default"):
+    """Create an API key entry with metadata"""
+    api_key = generate_api_key()
+    
+    entry = {
+        "name": name,
+        "api_key": api_key,
+        "permissions": permissions.split(",") if isinstance(permissions, str) else permissions,
+        "environment": environment,
+        "created_at": datetime.utcnow().isoformat(),
+        "expires_at": (datetime.utcnow() + timedelta(days=365)).isoformat(),
+        "status": "active"
+    }
+    
+    return entry
+
+def main():
+    """Main function to generate API keys"""
+    print("🔑 AITBC API Key Generator")
+    print("=" * 50)
+    
+    # Generate different types of API keys
+    keys = []
+    
+    # Client API key (for job submission, agent operations)
+    client_key = create_api_key_entry(
+        name="client-test-key",
+        permissions="client",
+        environment="default"
+    )
+    keys.append(client_key)
+    
+    # Admin API key (for system administration)
+    admin_key = create_api_key_entry(
+        name="admin-test-key", 
+        permissions="client,admin",
+        environment="default"
+    )
+    keys.append(admin_key)
+    
+    # Miner API key (for mining operations)
+    miner_key = create_api_key_entry(
+        name="miner-test-key",
+        permissions="client,miner",
+        environment="default"
+    )
+    keys.append(miner_key)
+    
+    # Full access API key (for testing)
+    full_key = create_api_key_entry(
+        name="full-test-key",
+        permissions="client,admin,miner",
+        environment="default"
+    )
+    keys.append(full_key)
+    
+    # Display generated keys
+    print(f"\n📋 Generated {len(keys)} API Keys:\n")
+    
+    for i, key in enumerate(keys, 1):
+        print(f"{i}. {key['name']}")
+        print(f"   API Key: {key['api_key']}")
+        print(f"   Permissions: {', '.join(key['permissions'])}")
+        print(f"   Environment: {key['environment']}")
+        print(f"   Created: {key['created_at']}")
+        print()
+    
+    # Save to file
+    output_file = "/tmp/aitbc-api-keys.json"
+    with open(output_file, 'w') as f:
+        json.dump(keys, f, indent=2)
+    
+    print(f"💾 API keys saved to: {output_file}")
+    
+    # Show usage instructions
+    print("\n🚀 Usage Instructions:")
+    print("=" * 50)
+    
+    for key in keys:
+        if 'client' in key['permissions']:
+            print(f"# For {key['name']}:")
+            print(f"aitbc auth login {key['api_key']} --environment {key['environment']}")
+            print()
+    
+    print("# Test commands that require authentication:")
+    print("aitbc client submit --prompt 'What is AITBC?' --model gemma3:1b")
+    print("aitbc agent create --name test-agent --description 'Test agent'")
+    print("aitbc marketplace gpu list")
+    
+    print("\n✅ API keys generated successfully!")
+
+if __name__ == "__main__":
+    main()