feat(leathercraft): ancient runic leather horse girth extender bench engine

[angelTomo9]

Summary

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

Features

• Horse girth extender bench catalog (Elder Girth Extender Bench, Runic Oak Girth Extender Rig, Celestial Void Valkyrie Girth Extender Sanctum)
• Raw tanned bull girth extender straps and tempered mithril double tongue buckle sets
• Novice expedition girth extender and sovereign aerial girth extender recipes
• Independent steed ribcage-breathing flexibility ratings and billet extension security ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped ribcage breathing flexibility bonus and billet extension security 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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