feat(leathercraft): ancient runic leather horse tie down bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse tie down bench, mithril snap ring rig, and celestial valkyrie tie down sanctum engine for OpenAO MMORPG.

Features

• Horse tie down bench catalog (Elder Tie Down Bench, Runic Oak Tie Down Rig, Celestial Void Valkyrie Tie Down Sanctum)
• Raw tanned bull tie down straps and tempered mithril snap ring sets
• Novice expedition tie down and sovereign aerial tie down recipes
• Independent steed head-carriage control ratings and chest tension stability ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped head carriage control bonus and chest tension stability 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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