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

[angelTomo9]

Summary

Implements an ancient runic leather horse breastplate bench, mithril three-point ring tension rig, and celestial valkyrie pectoral engine for OpenAO MMORPG.

Features

• Horse breastplate bench catalog (Birch Breastplate Bench, Runic Walnut Harness Rig, Celestial Void Valkyrie Pectoral Sanctum)
• Raw tanned buffalo pectoral straps and tempered mithril three-point ring sets
• Novice ridge pectoral breastplate and sovereign aerial breastplate recipes
• Dynamic chest stability rating with calibrated backward slip mitigation and chest pressure 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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