legal: enforce proprietary licensing and anti-impersonation notice

[NeuroKoder3]

Summary

• replace MIT license text with a proprietary license notice that requires explicit authorization and activation/license entitlement
• add a new LEGAL_NOTICE.md and update README.md, SECURITY.md, and TRADEMARK.md with trusted-channel, anti-impersonation, and safety warnings
• update package metadata to mark the project license as Proprietary

Test plan

• Verify documentation files render correctly in markdown
• Confirm package.json license field is updated
• Ensure legal and warning language points to official repository/release channels