feat(leathercraft): ancient runic leather horse pommel bag bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse pommel bag bench, mithril latch rig, and celestial valkyrie pommel sanctum engine for OpenAO MMORPG.

Features

• Horse pommel bag bench catalog (Elder Pommel Bag Bench, Runic Oak Pommel Bag Rig, Celestial Void Valkyrie Pommel Sanctum)
• Raw tanned buffalo pommel pouch straps and tempered mithril pommel latch sets
• Novice expedition pommel bag and sovereign aerial pommel bag recipes
• Independent steed quick-access efficiency ratings and saddle horn balance ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped quick access efficiency bonus and saddle horn balance 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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