Module tool_error 

Structured error types for tool execution

This module provides precise, actionable error types for the VEX Tool System. Uses thiserror for automatic std::error::Error implementation.

Security Considerations

• Error messages sanitize sensitive data (no raw args in messages)
• Timeout errors prevent DoS from hanging tools
• Validation errors provide safe feedback without exposing internals

Enums

ToolError

Error types for tool execution with precise variants for each failure mode.