[RamType0]

Summary

• Initialize CI-only Git metadata and an empty commit at the generated Unity project root so the CLI can resolve Git/version information, preserving the independent package checkout.
• Validate PR changes with pull_request rather than pull_request_target; retain main-branch push and manual runs without duplicate branch-push matrices.
• Keep cliVersion unpinned (latest) and authenticate latest-release lookup via GITHUB_TOKEN to avoid the observed unauthenticated API 403.
• Add Physics 2D to the generated manifest for VRChat SDK/DOTween.
• Free unused host Android/.NET/Haskell SDK space so the Unity 6000.0 Docker image can be extracted. Do not purge host packages, tool cache, Docker images, or swap.
• Use existing Unity account credentials directly for 6000.0.51f1: legacy ULF import was accepted but left the Editor without a valid entitlement. Stored secrets are unchanged.
• Add the missing tests ID, explicit checkout read permission, and guards against artifact paths falling back to the project root.

Scope

Only .github/workflows/run-tests.yml changes; no library/test implementation changes.
Same-repository PRs can use the existing Unity secrets; fork PRs do not receive secrets under the standard pull_request model.

Validation

• YAML parsing, embedded manifest JSON validation, and git diff --check passed.
• Generated-project Git smoke check passed: HEAD/branch resolve and the nested package retains its own Git root.
• Latest head 6416235924b8c928b36308f9548ba530365a027f: all 6/6 Unity matrix jobs passed in PR CI.
• Unity 6000.0.51f1: PlayMode and Standalone passed (20/20 tests each).
• Unity 6000.1.8f1: PlayMode and Standalone passed.
• Unity 2022.3.22f1: both VPM EditMode combinations passed.
• This validates the actual latest CLI fetched during these runs, not future upstream releases.
• PR is intentionally left unmerged.