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

[angelTomo9]

Summary

Implements an ancient runic leather horse crupper bench, mithril tail dock rig, and celestial valkyrie crupper sanctum engine for OpenAO MMORPG.

Features

• Horse crupper bench catalog (Elder Crupper Bench, Runic Oak Crupper Rig, Celestial Void Valkyrie Crupper Sanctum)
• Raw tanned stallion crupper straps and tempered mithril crupper dock ring sets
• Novice expedition crupper and sovereign aerial crupper recipes
• Independent steed downhill-saddle retention ratings and tail dock comfort ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped downhill saddle retention bonus and tail dock 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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