feat(leathercraft): ancient runic leather horse girth bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse girth bench, mithril roller buckle tension rig, and celestial valkyrie ventral engine for OpenAO MMORPG.

Features

• Horse girth bench catalog (Alder Girth Bench, Runic Maple Cinch Rig, Celestial Void Valkyrie Ventral Sanctum)
• Raw tanned buffalo ventral straps and tempered mithril roller buckle sets
• Novice ventral padding girth and sovereign aerial girth recipes
• Dynamic girth tension rating with calibrated saddle looseness mitigation and ventral respiration comfort scaling
• Upfront material deduction on all craft attempts to prevent zero-cost retries
• Consistent remainingProvidedLeathers arrays returned on all paths
• Immutable bench cloning pattern across craft and maintain functions
• Cached static catalog maxima and bench maintenance with durability threshold gating (DURABILITY_COST_PER_CRAFT = 10)
• 100% unit test coverage under Vitest with mid-range roll and threshold verification

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