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

[angelTomo9]

Summary

Implements an ancient runic leather horse throatlatch bench, mithril throat buckle tension rig, and celestial valkyrie throatlatch sanctum engine for OpenAO MMORPG.

Features

• Horse throatlatch bench catalog (Elder Throatlatch Bench, Runic Ash Throatlatch Rig, Celestial Void Valkyrie Throatlatch Sanctum)
• Raw tanned buffalo throatlatch straps and tempered mithril throat buckle sets
• Novice submandibular throatlatch and sovereign aerial throatlatch recipes
• Independent steed bridle-retention ratings and combat dislodgement mitigation ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped bridle retention bonus and combat dislodgement mitigation 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 (7/7 passing) with mid-range roll and durability gating verification

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