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

[angelTomo9]

Summary

Implements an ancient runic leather horse stirrup fender bench, mithril slider rig, and celestial valkyrie fender sanctum engine for OpenAO MMORPG.

Features

• Horse stirrup fender bench catalog (Elder Fender Bench, Runic Oak Fender Rig, Celestial Void Valkyrie Fender Sanctum)
• Raw tanned buffalo fender panels and tempered mithril fender slider sets
• Novice reinforced leg fender and sovereign aerial fender recipes
• Independent steed leg-friction protection ratings and stirrup sway mitigation ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped leg friction protection bonus and stirrup sway mitigation 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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