MetalQuestLink 0.2.0

First public open-source release of MetalQuestLink.\n\nIncludes the installable Unity Package Manager tarball, a prebuilt Meta Quest APK, checksums, Unity version compatibility improvements, and English/Japanese documentation.\n\nThe macOS native library is ad-hoc signed and not notarized. See README.md and docs/compatibility.md before installation. The rename from MaQuestLink is a breaking migration; see docs/migration-0.2.md.