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

[angelTomo9]

Summary

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

Features

• Horse martingale bench catalog (Elder Martingale Bench, Runic Oak Martingale Rig, Celestial Void Valkyrie Martingale Sanctum)
• Raw tanned centaur martingale straps and tempered mithril martingale fork ring sets
• Novice expedition martingale and sovereign aerial martingale recipes
• Independent steed rein-tension stability ratings and head toss prevention ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped rein tension stability bonus and head toss prevention 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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