Publish OpticalModeler multilingual skill

[k-telux]

What changed

• publish the complete evidence-first Blender optical-path skill
• add English, Simplified Chinese, and Japanese entry points
• include a sanitized 2D-to-3D G1/G2 example with machine-readable acceptance evidence
• add MIT licensing, contribution/security guidance, citation metadata, and CI validation
• brand the public project as OpticalModeler while keeping the stable $thorlabs-blender-optical-path skill identifier

Why

The repository was an empty public placeholder. This release turns it into an installable, auditable Agent Skills project without distributing vendor CAD, private laboratory paths, or oversized Blend files.

Validation

• python scripts/validate_repository.py
• official quick_validate.py for English, Simplified Chinese, and Japanese editions
• git diff --check
• public GitHub page and rendered README will be visually audited after CI