feat(leathercraft): ancient runic leather horse saddle pad bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse saddle pad bench, mithril quilting thread tension rig, and celestial valkyrie wither engine for OpenAO MMORPG.

Features

• Horse saddle pad bench catalog (Linden Saddle Pad Bench, Runic Chestnut Quilting Rig, Celestial Void Valkyrie Wither Sanctum)
• Raw tanned buffalo wither pad blanks and tempered mithril quilting thread sets
• Novice spinal shock saddle pad and sovereign aerial pad recipes
• Dynamic wither shock absorption rating with calibrated spine friction mitigation and heat dissipation 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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