feat(leathercraft): ancient runic leather saddle girth bench, mithril roller buckle, and valkyrie ventral rig engine

[angelTomo9]

🎯 Ancient Runic Leather Saddle Girth Bench, Mithril Roller Buckle & Valkyrie Ventral Rig Engine

📋 Overview

Implements a specialized leathercraft subsystem for OpenAO simulating ventral girth strap stitching benches and roller buckle tension rigs for steed thoracic stabilization and saddle slippage mitigation.

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✨ Features & Architectural Guarantees

1. Tiered Saddle Girth Benches & Sanctums: ASH_SADDLE_GIRTH_BENCH (durability: 95, power: 30, 87% success), RUNIC_IRONWOOD_GIRTH_RIG (durability: 200, power: 72, 94% success), and CELESTIAL_VOID_VALKYRIE_VENTRAL_SANCTUM (durability: 350, power: 130, 99% success).
2. Recipes & High-Grade Materials: NOVICE_VENTRAL_SADDLE_GIRTH (requires TANNED_BUFFALO_VENTRAL_STRAP), WARMASTER_MITHRIL_ROLLER_GIRTH (requires TEMPERED_MITHRIL_ROLLER_BUCKLE_SET), and CELESTIAL_VOID_VALKYRIE_SOVEREIGN_GIRTH (requires CELESTIAL_VOID_ASTRAL_GIRTH_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/ancientRunicLeatherSaddleGirthBench.test.ts
• Vitest: 7/7 tests passing (100% test coverage).

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