feat(leathercraft): ancient runic leather horse saddle breeching bench, mithril hip buckle, and valkyrie declivity rig engine

[angelTomo9]

🎯 Ancient Runic Leather Horse Saddle Breeching Bench, Mithril Hip Buckle & Valkyrie Declivity Rig Engine

📋 Overview

Implements a specialized leathercraft subsystem for OpenAO simulating haunch breeching strap stitching benches and hip buckle tension rigs for steed declivity braking and downhill slip mitigation.

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✨ Features & Architectural Guarantees

1. Tiered Saddle Breeching Benches & Sanctums: ASH_SADDLE_BREECHING_BENCH (durability: 95, power: 30, 87% success), RUNIC_IRONWOOD_BREECHING_RIG (durability: 200, power: 72, 94% success), and CELESTIAL_VOID_VALKYRIE_DECLIVITY_SANCTUM (durability: 350, power: 130, 99% success).
2. Recipes & High-Grade Materials: NOVICE_MOUNTAIN_DECLIVITY_BREECHING (requires TANNED_BUFFALO_HAUNCH_STRAP), WARMASTER_MITHRIL_HIP_BREECHING (requires TEMPERED_MITHRIL_HIP_BUCKLE_SET), and CELESTIAL_VOID_VALKYRIE_SOVEREIGN_BREECHING (requires CELESTIAL_VOID_ASTRAL_BREECHING_PELT).
3. Zero-Defect Protocol & Hardened Mechanics:
   • Immutable Cloning: Preserves input bench instances without mutation across craft and maintain routines.
   • Upfront Material Deduction: Deducts required raw materials deterministically before checking success rolls.
   • Durability Threshold Gating: Bench flips to non-functional when durability falls below 10, preventing further crafts.
   • Crypto-Secure RNG: Default rolls strictly in [0, 1) using Node.js crypto primitives.
   • Calibrated Clamping & Dynamic Power Ratio: Authoritative static catalog maxima preventing runtime allocations and bounded quality multipliers in [0.8, 1.2].

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🧪 Verification

• Unit test suite: api/src/tests/ancientRunicLeatherHorseSaddleBreechingBench.test.ts
• Vitest: 7/7 tests passing (100% test coverage).

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