feat(leathercraft): ancient runic leather horse curb strap bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse curb strap bench, mithril fulcrum rig, and celestial valkyrie curb strap sanctum engine for OpenAO MMORPG.

Features

• Horse curb strap bench catalog (Elder Curb Strap Bench, Runic Oak Curb Strap Rig, Celestial Void Valkyrie Curb Strap Sanctum)
• Raw tanned mare curb straps and tempered mithril curb fulcrum hook sets
• Novice expedition curb strap and sovereign aerial curb strap recipes
• Independent steed curb-bit leverage regulation ratings and mandibular comfort ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped curb bit leverage regulation bonus and mandibular 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 (7/7 passing) with mid-range roll and durability gating verification

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