feat(leathercraft): ancient runic leather horse stirrup leathers bench engine

[angelTomo9]

Summary

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

Features

• Horse stirrup leathers bench catalog (Elder Stirrup Leathers Bench, Runic Oak Stirrup Leathers Rig, Celestial Void Valkyrie Stirrup Leathers Sanctum)
• Raw tanned heavy ox stirrup straps and tempered mithril stirrup buckle bar sets
• Novice expedition stirrup leathers and sovereign aerial stirrup leathers recipes
• Independent steed rider-weight suspension ratings and tensile anti-stretch ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped rider weight suspension bonus and tensile anti-stretch 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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