feat(leathercraft): ancient runic leather horse saddle bags bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse saddle bags bench, mithril flap clasp tension rig, and celestial valkyrie expedition engine for OpenAO MMORPG.

Features

• Horse saddle bags bench catalog (Elder Saddle Bags Bench, Runic Oak Pannier Rig, Celestial Void Valkyrie Expedition Sanctum)
• Raw tanned buffalo pannier straps and tempered mithril flap clasp sets
• Novice expedition trail saddle bags and sovereign aerial bag recipes
• Independent steed payload-sway mitigation and payload balance ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped payload sway mitigation bonus and cargo volume capacity 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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