ci: cross-arch streflop determinism gate#10
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Build tools/sync-test on ubuntu (SSE) and macOS (NEON), then assert bit-identical results — the multiplayer guarantee that Apple-Silicon agrees with gcc/x86. Runs on push to main and on PRs touching determinism-relevant paths (streflop, sse2neon, FastMath.h, the test), plus workflow_dispatch. Fork-specific so it does not collide with the upstream-derived streflop-float-test.yml (which is x86-only, manual, and needs submodule init to run).
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Adds a fork-specific workflow that builds the streflop float test on x86_64 (SSE) and arm64 (NEON) and asserts bit-identical results — the multiplayer determinism guarantee for the macOS fork. Supersedes the upstream streflop-float-test.yml (x86-only, manual, broken without submodule init). Opening this PR primarily to run the new CI and verify it goes green before landing on main.