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

[angelTomo9]

Summary

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

Features

• Horse stirrup leathers bench catalog (Rowan Stirrup Leathers Bench, Runic Hickory Stirrup Rig, Celestial Void Valkyrie Stride Sanctum)
• Raw tanned buffalo stirrup straps and tempered mithril tongue buckle sets
• Novice riders suspension stirrup leathers and sovereign aerial stirrup recipes
• Dynamic stirrup suspension rating with calibrated ankle strain mitigation and rider stride 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 with mid-range roll and threshold verification

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