fix: include response body and operation context in HTTP error messages

[gabdorf]

Summary

• Enhanced HTTP error messages to include the response body from the API for better debugging
• Added operation context to error messages (e.g., "Failed to create task:")
• Helps users understand what went wrong when API calls fail

Changes

Modified wrapToolError() in src/tools/errors.ts to:

• Include the operation name in the error message
• Append the API response body (JSON) when available

Before

HTTP error (client_error): Request failed with status 400

After

Failed to create task: HTTP error (client_error): Request failed with status 400 - Response: {"error": "Invalid field value"}

Closes #1