Add export texture dependency inspection

[Ker102]

Summary

• Add inspect_export_texture_dependencies to inspect selected meshes' image texture dependencies before export.
• Report resolved texture paths with linked-library context, missing textures, empty image filepaths, packed images, and risky portable-export formats.
• Feed structured texture_dependencies and empty_texture_paths into validate_export_readiness object reports.
• Wire the tool through LangChain, registry/filtering, system prompt, export guide, guide coverage, and capability inventory.

Validation

• npx tsx scripts/test/test-blender-export-texture-dependencies.ts
• python -m py_compile desktop/assets/vipermesh-addon.py public/downloads/vipermesh-addon.py
• npx tsx scripts/test/test-blender-uv-export-validation.ts
• npx tsx scripts/test/test-tool-guide-trigger-coverage.ts
• npx tsx scripts/test/test-blender-capability-inventory.ts
• npx tsc --noEmit --incremental false
• npm run lint (passes; existing baseline-browser-mapping age warning)
• git diff --check (passes; Windows line-ending warnings only)

[coderabbitai]

Caution

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/blender-export-edgecase-tools

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