docs: add Procedural armor appearance page (v0.193.0, PR #241) New Feature-Armor-Appearance.md documenting the 30% leather-dye + 15% trim cosmetic rolls on naturally-spawned armor, with a corresponding index entry on Features.md next to Procedural item naming. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>