[S3-063] Verify civilization-specific balance and terrain behavior

Accidental duplicate of https://github.com/stacksjs/the-settlers-iii-remake/issues/65, 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 S3-063 in https://github.com/stacksjs/the-settlers-iii-remake/issues/65.