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

[angelTomo9]

Summary

Implements an ancient runic leather horse breastplate bench, mithril yoke rig, and celestial valkyrie breastplate sanctum engine for OpenAO MMORPG.

Features

• Horse breastplate bench catalog (Elder Breastplate Bench, Runic Oak Breastplate Rig, Celestial Void Valkyrie Breastplate Sanctum)
• Raw tanned warsteed breastplate straps and tempered mithril breastplate chest ring sets
• Novice expedition breastplate and sovereign aerial breastplate recipes
• Independent steed uphill-saddle retention ratings and chest armor protection ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped uphill saddle retention bonus and chest armor protection 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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