The x86_64-apple-darwin release crashed at V8 isolate init with SIGSEGV in
ReadOnly snapshot deserialization (issue #290). obscura-js bakes a V8 startup
snapshot at build time via a build script, which runs on the host arch. The
job built x86_64 on macos-latest (Apple Silicon), so an arm64 snapshot got
embedded into the Intel binary and V8 crashed deserializing it. Build on
macos-15-intel so the snapshot matches the target.
Drop the aarch64-linux-cross artifact: it has the same defect (x86_64-host
snapshot in an arm64 binary) and the native ARM runner already covers it.
Add a post-build smoke test that runs the V8 path on a data: URL so a release
can never ship a binary that crashes at isolate init again.
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