Remove console.error and implement proper error logging in signing module

[theref]

Overview

The signing module currently uses console.error for error logging, which is not ideal for production code. This should be replaced with a proper error handling mechanism that doesn't output to console in production environments.

Current Behavior

In packages/taco/src/sign.ts:157-160, there's a console.error statement:

console.error(
  'Porter returned mismatched message hashes:',
  hashToSignatures,
);

Expected Behavior

• Remove the console.error statement
• The error information should be included in the thrown error or handled through a proper logging mechanism
• Consider including the mismatched hashes information in the error message itself

Files to Change

• packages/taco/src/sign.ts (line 157-160)

Implementation Suggestions

1. Include the debug information in the error message that's thrown
2. Consider creating a debug mode flag that conditionally logs verbose information
3. Ensure sensitive information isn't exposed in error messages

Definition of Done

• [ ] console.error removed from the code
• [ ] Error information is still accessible for debugging
• [ ] Tests still pass
• [ ] No console output in production builds