Merges PR #165 and PR #172.
PR #165: The CDP spec marks canAccessOpener as a required boolean on
TargetInfo but Obscura was omitting it. Strict Rust clients like
chromiumoxide reject the event entirely and panic with "Created target
not present" when the field is absent. Added canAccessOpener: false
to every TargetInfo emitted by setDiscoverTargets, getTargets,
createTarget, attachToBrowserTarget, attachToTarget, and getTargetInfo.
PR #172: Added a cross-compile matrix entry for aarch64-unknown-linux-gnu
running on ubuntu-22.04 x86_64, producing obscura-aarch64-linux-cross.
This is a fallback for when GitHub ARM runners are unavailable without
removing the native ARM build.
Uses GitHub's native ubuntu-22.04-arm runner so it's a native build
matching the same glibc 2.35 floor as the x86_64 target. README gets
the matching install snippet.
The current ubuntu-latest Linux release can require a newer glibc than common LTS servers provide. Pinning the x86_64 Linux release job to Ubuntu 22.04 keeps the prebuilt binary compatible with glibc 2.35+ environments while leaving macOS and Windows release jobs unchanged.
Also document the Linux LTS compatibility target in the install section so users understand why the release runner is pinned.
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