Proposal 1:
Change error type

Proposal 2:
Currently same error code no_license is used for missing license in readme and plugin header which is confusing. Similar for invalid_license.

My proposal is keeping same error code for readme and add introduce separate error code for plugin header license check:

• plugin_header_no_license
• plugin_header_invalid_license

Proposal 3:
Regarding license check:

• Check one - Check if License is valid SPDX identifier (We could use error code like invalid_license_identifier and plugin_header_invalid_license_identifier)
• Check two - Check if License is GPL compatible (Use existing error code for this - invalid_license)