feat(leathercraft): ancient runic leather horse flank cinch bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse flank cinch bench, mithril buckle tension rig, and celestial valkyrie flank sanctum engine for OpenAO MMORPG.

Features

• Horse flank cinch bench catalog (Elder Flank Cinch Bench, Runic Oak Flank Cinch Rig, Celestial Void Valkyrie Flank Sanctum)
• Raw tanned buffalo flank cinch straps and tempered mithril flank buckle sets
• Novice rear stabilizer flank cinch and sovereign aerial flank cinch recipes
• Independent steed incline-stability ratings and saddle roll mitigation ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped incline stability bonus and saddle roll 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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