feat(leathercraft): ancient runic leather horse stirrup pads bench engine

[angelTomo9]

Summary

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

Features

• Horse stirrup pads bench catalog (Elder Stirrup Pads Bench, Runic Oak Stirrup Pads Rig, Celestial Void Valkyrie Stirrup Pads Sanctum)
• Raw tanned buffalo stirrup pad treads and tempered mithril stirrup cleat inserts
• Novice expedition stirrup pads and sovereign aerial stirrup pads recipes
• Independent steed plantar-shock absorption ratings and boot grip adhesion ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped plantar shock absorption bonus and boot grip adhesion 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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