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

[angelTomo9]

Summary

Implements an ancient runic leather horse reins bench, mithril bit-coupling clasp tension rig, and celestial valkyrie steerage engine for OpenAO MMORPG.

Features

• Horse reins bench catalog (Yew Reins Bench, Runic Ash Bridle Rig, Celestial Void Valkyrie Steerage Sanctum)
• Raw tanned buffalo split rein straps and tempered mithril bit coupling clasps
• Novice trail split reins and sovereign aerial rein recipes
• Dynamic steerage responsiveness rating with calibrated turning lag mitigation and steerage precision 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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