Gold Edition epic 12: Performance, qualification, and finished release

Accidental duplicate of https://github.com/stacksjs/the-settlers-iii-remake/issues/16, created on 2026-10-22 when an interrupted roadmap publish (the disk filled during the run) could not see the existing issues. Closed without work; track S3-E12 in https://github.com/stacksjs/the-settlers-iii-remake/issues/16.