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

[angelTomo9]

Summary

Implements an ancient runic leather horse cheekpiece bench, mithril bit coupling rig, and celestial valkyrie cheekpiece sanctum engine for OpenAO MMORPG.

Features

• Horse cheekpiece bench catalog (Elder Cheekpiece Bench, Runic Ash Cheekpiece Rig, Celestial Void Valkyrie Cheekpiece Sanctum)
• Raw tanned buffalo cheekpiece straps and tempered mithril bit coupling sets
• Novice vertical suspension cheekpiece and sovereign aerial cheekpiece recipes
• Independent steed bit-alignment ratings and mouthpiece comfort ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped bit alignment bonus and mouthpiece 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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