feat(leathercraft): ancient runic leather horse cantle roll bench engine

[angelTomo9]

Summary

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

Features

• Horse cantle roll bench catalog (Elder Cantle Roll Bench, Runic Oak Cantle Roll Rig, Celestial Void Valkyrie Cantle Sanctum)
• Raw tanned buffalo cantle roll straps and tempered mithril cantle buckle sets
• Novice expedition cantle roll and sovereign aerial cantle roll recipes
• Independent steed bedroll-storage capacity ratings and lumbar support ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped bedroll storage capacity bonus and lumbar support 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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