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

[angelTomo9]

Summary

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

Features

• Horse cavesson bench catalog (Elder Cavesson Bench, Runic Oak Cavesson Rig, Celestial Void Valkyrie Cavesson Sanctum)
• Raw tanned colt cavesson straps and tempered mithril cavesson nose ring sets
• Novice expedition cavesson and sovereign aerial cavesson recipes
• Independent steed lateral-flexion control ratings and jaw pressure distribution ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped lateral flexion control bonus and jaw pressure distribution 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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