GuaとCIテスト基盤をv1.18.0およびv2.2へ更新する

[link1345]

概要

• Unity向けGuaパッケージとテスト用NuGetパッケージをv1.18.0へ更新
• gua-testerとVisualレポートActionをv2.2へ更新
• READMEのバージョン表記と検証対象を更新

テスト

• 未実行（依頼されていないため）

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Replace the vendored runtime, not just its manifest

When Unity builds this embedded package, it continues to ship the old runtime because this commit changes only the manifest: the tracked managed assemblies still report 0.15.0.0, and both native DLLs identify their core/runtime version as 0.15.0. Since Packages/manifest.json references this directory as a local embedded package, declaring it as 1.18.0 does not download replacement binaries; the sample therefore runs 0.15.0 while the test project and CI tooling expect 1.18.0. Replace all vendored managed and native artifacts with the actual 1.18.0 package contents.

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