feat(leathercraft): ancient runic leather horse crownpiece bench engine

[angelTomo9]

Summary

Implements an ancient runic leather horse crownpiece bench, mithril poll padding rig, and celestial valkyrie crownpiece sanctum engine for OpenAO MMORPG.

Features

• Horse crownpiece bench catalog (Elder Crownpiece Bench, Runic Ash Crownpiece Rig, Celestial Void Valkyrie Crownpiece Sanctum)
• Raw tanned buffalo crownpiece straps and tempered mithril poll padding sets
• Novice anatomical poll crownpiece and sovereign aerial crownpiece recipes
• Independent steed poll-comfort ratings and bit responsiveness ratings (scaled across catalog baselines ~16% to 100%)
• Calibrated clamped poll comfort bonus and bit responsiveness 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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