docs: add AGENTS.md with development environment tips

[ViTeXFTW]

Greptile Overview

Greptile Summary

Added .github/AGENTS.md to provide development environment guidance for AI agents and developers working on the Vulkan W3D viewer project.

• Documented build and run commands with preset variables
• Listed W3D format quirks and special handling requirements
• Added testing instructions with ctest commands
• Specified PR requirements for conventional commit format
• Three spelling errors need correction: "configur" → "configure", "c overage" → "coverage", "commiting" → "committing"

Confidence Score: 4/5

• Safe to merge after fixing spelling errors
• Documentation-only change with helpful content but contains three spelling errors that should be corrected
• .github/AGENTS.md needs spelling corrections before merge

Important Files Changed

Filename	Overview
.github/AGENTS.md	Added development environment documentation with minor spelling errors (configur, c overage, commiting)

[greptile-apps]

_{1 file reviewed, 3 comments}

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