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

[angelTomo9]

Summary

Implements an ancient runic leather horse crupper bench, mithril forked boss tension rig, and celestial valkyrie tail-dock engine for OpenAO MMORPG.

Features

• Horse crupper bench catalog (Elm Crupper Bench, Runic Yew Tail Rig, Celestial Void Valkyrie Dock Sanctum)
• Raw tanned buffalo dock straps and tempered mithril forked boss sets
• Novice hill dock crupper and sovereign aerial crupper recipes
• Dynamic dock retention rating with calibrated forward slip mitigation and tail dock 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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