remove unused queue.py module and refactor chain_id handling in CLI

Deleted aitbc/queue.py containing TaskQueue, JobScheduler, BackgroundTaskManager, and WorkerPool classes that were not being used in the codebase.

Refactored chain_id handling in CLI to use centralized get_chain_id utility function instead of duplicating chain_id detection logic in send_transaction, get_balance, and agent_operations functions.

cli/aitbc_cli/utils/chain_id.py

@@ -0,0 +1,78 @@
+"""Chain ID utilities for AITBC CLI
+
+This module provides functions for auto-detecting and validating chain IDs
+from blockchain nodes, supporting multichain operations.
+"""
+
+from typing import Optional
+from aitbc import AITBCHTTPClient, NetworkError
+
+
+# Known chain IDs
+KNOWN_CHAINS = ["ait-mainnet", "ait-devnet", "ait-testnet", "ait-healthchain"]
+
+
+def get_default_chain_id() -> str:
+    """Return the default chain ID (ait-mainnet for production)."""
+    return "ait-mainnet"
+
+
+def validate_chain_id(chain_id: str) -> bool:
+    """Validate a chain ID against known chains.
+    
+    Args:
+        chain_id: The chain ID to validate
+        
+    Returns:
+        True if the chain ID is known, False otherwise
+    """
+    return chain_id in KNOWN_CHAINS
+
+
+def get_chain_id_from_health(rpc_url: str, timeout: int = 5) -> str:
+    """Auto-detect chain ID from blockchain node's /health endpoint.
+    
+    Args:
+        rpc_url: The blockchain node RPC URL (e.g., http://localhost:8006)
+        timeout: Request timeout in seconds
+        
+    Returns:
+        The detected chain ID, or default if detection fails
+    """
+    try:
+        http_client = AITBCHTTPClient(base_url=rpc_url, timeout=timeout)
+        health_data = http_client.get("/health")
+        supported_chains = health_data.get("supported_chains", [])
+        
+        if supported_chains:
+            # Return the first supported chain (typically the primary chain)
+            return supported_chains[0]
+    except NetworkError:
+        pass
+    except Exception:
+        pass
+    
+    # Fallback to default if detection fails
+    return get_default_chain_id()
+
+
+def get_chain_id(rpc_url: str, override: Optional[str] = None, timeout: int = 5) -> str:
+    """Get chain ID with override support and auto-detection fallback.
+    
+    Args:
+        rpc_url: The blockchain node RPC URL
+        override: Optional chain ID override (e.g., from --chain-id flag)
+        timeout: Request timeout in seconds
+        
+    Returns:
+        The chain ID to use (override takes precedence, then auto-detection, then default)
+    """
+    # If override is provided, validate and use it
+    if override:
+        if validate_chain_id(override):
+            return override
+        # If unknown, still use it (user may be testing new chains)
+        return override
+    
+    # Otherwise, auto-detect from health endpoint
+    return get_chain_id_from_health(rpc_url, timeout)