feat: add game texture alignment APIs

[agustin-littlehat]

Summary

• add public texture leaf sizing, image source, presentation, and readiness APIs for game ports
• expose camera snapshot/projection helpers and world/CSS transform conversion helpers across core, vanilla, React, and Vue
• expand render stats/query helpers and visual benchmark coverage for browser-fast-path texture alignment checks

Validation

• pnpm test
• pnpm build
• pnpm bench:visual passed before the final rebase; rebased branch keeps the updated visual baselines
• cssQuake temp-package check: local PolyCSS tarball builds; remaining shootable-runtime failure reproduces with published PolyCSS too
• cssforsaken temp-package check: local PolyCSS tarball passes pnpm build and pnpm test; full assets/browser gates are blocked by missing local ForsakenX data