feat(leathercraft): ancient runic leather stirrup leathers bench, mithril tread, and valkyrie rig engine

[angelTomo9]

🎯 Ancient Runic Leather Stirrup Leathers Bench, Mithril Tread Iron & Valkyrie Aerial Rig Engine

📋 Overview

Implements a specialized leathercraft subsystem for OpenAO simulating stirrup strap stitching benches and tread iron shaping rigs for equestrian combat balance and aerial mounting.

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✨ Features & Architectural Guarantees

1. Tiered Stirrup Leathers Benches & Sanctums: ASH_STIRRUP_LEATHER_BENCH (durability: 85, power: 25, 85% success), RUNIC_IRONWOOD_KNIGHT_RIG (durability: 190, power: 65, 92% success), and CELESTIAL_VOID_VALKYRIE_AERIAL_SANCTUM (durability: 330, power: 120, 99% success).
2. Recipes & High-Grade Materials: NOVICE_MOUNTED_STIRRUP_LEATHER (requires TANNED_HEAVY_BUFFALO_STIRRUP_STRAP), WARMASTER_MITHRIL_TREAD_STIRRUP (requires TEMPERED_MITHRIL_TREAD_IRON_SET), and CELESTIAL_VOID_VALKYRIE_AERIAL_STIRRUP (requires CELESTIAL_VOID_STARLIGHT_VALKYRIE_LEATHER).
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/ancientRunicLeatherStirrupLeathersBench.test.ts
• Vitest: 7/7 tests passing (100% test coverage).

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