feat(leathercraft): ancient runic leather saddle bag bench, rivet buckle, and mount haversack engine

[angelTomo9]

Summary

Implements an ancient runic leather saddle bag bench, brass rivet buckle anvil, and mount pannier crafting system, saddle bag benches (Oak Saddle Bag Bench, Runic Ironwood Mount Rig, Celestial Void Seraphic Caravan Sanctum), raw tanned horsehide pannier blanks and brass riveted buckle sets (Tanned Horsehide Pannier Blank, Brass Riveted Buckle Set, Celestial Void Starlight Sovereign Caravan Leather), mount saddle bag recipes (Courier Fast-Access Saddle Bag, Caravan Heavy Double Pannier, Celestial Void Seraphic Dimension-Folded Mount Haversack), quick-loot accessibility ratings (scaled across catalog baselines ~14% to 100%), calibrated mount carrying capacity bonus and stamina depletion mitigation scaling, upfront material deduction on all attempts, consistent remainingProvidedLeathers shapes across all branches, immutable bench cloning on craft and maintain operations, extensionless test import with import type separation, crypto-secure default gameplay rolls strictly in [0, 1), and saddle bag bench maintenance for OpenAO MMORPG.

Features

• Saddle bag bench catalog with power ratings, durability, and quickloot bonuses
• Mount saddle bag recipes with calibrated carrying capacity and stamina mitigation scaling
• Independent quick-loot accessibility quality roll scaling
• Upfront material deduction on all craft attempts to prevent zero-cost retries
• Consistent remainingProvidedLeathers arrays returned on all early rejection branches
• Immutable bench cloning pattern across craft and maintain functions to safeguard caller state references
• Cached static catalog maxima and table maintenance with durability threshold gating
• Full unit test coverage under Vitest including mid-range accessibility tests

[gitar-bot]

Code Review ✅ Approved

Implements a comprehensive leathercraft system for OpenAO MMORPG with saddle bag benches, rivet buckle crafting, and mount haversack recipes. Features include calibrated carrying capacity bonuses, stamina mitigation scaling, immutable bench cloning to prevent state corruption, upfront material deduction, and consistent quick-loot accessibility ratings. Full unit test coverage included. No issues found.

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