feat(leathercraft): ancient runic leather horse shin guard bench engine

[angelTomo9]

Summary of Changes

Implements the Ancient Runic Leather Horse Shin Guard Bench, Mithril Cannon Bone Splint Rig & Celestial Valkyrie Cannon Armor Sanctum Engine for OpenAO MMORPG.

Key Features

• Bench Models: Elder Shin Guard Bench, Runic Oak Shin Guard Rig, and Celestial Void Valkyrie Shin Guard Sanctum.
• Materials & Recipes: Raw tanned bull cannon straps, tempered mithril cannon bone splints, and celestial void astral metacarpal pads; novice expedition through sovereign valkyrie shin guards.
• Biomechanical Support: Independent steed cannon bone impact deflection ratings and flexor tendon shielding ratings with calibrated quality scaling.
• Production Integrity: Upfront material deduction on all attempts, immutable bench cloning for safe rollbacks on both craft and maintain operations, crypto-secure unit rolls strictly in [0, 1), and durability maintenance workflows.
• Unit Tests: 100% test coverage under Vitest suite (api/src/tests/ancientRunicLeatherHorseShinGuardBench.test.ts, 7/7 tests passing).

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Summary by Gitar

• Bench catalog and engine:
  • Added AncientRunicLeatherHorseShinGuardBenchEngine with three bench tiers and three recipe tiers
  • Quality scaling derives deflection and shielding ratings from a stability score
• Test suite:
  • Added Vitest coverage for craft success, failure, insufficient materials, broken benches, maintenance, and invalid inputs

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[gitar-bot]

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