[apotema]

Enabling WASM pthreads makes the synchronous parallel Floyd-Warshall implementation reachable. Zig 0.16 CPU discovery then links unsupported sysctlbyname, and the implementation cannot reserve workers from the browser pool shared with persistent engine asset workers.

Keep both the public optimized algorithm and the navigation wrapper on their existing SIMD/scalar path for Emscripten and single-threaded targets. Native multithreaded behavior remains enabled.

Validation:

• zig build test -j2 passed with Zig 0.16.
• zig build spec -j2: all 65 navigation specifications passed.
• FP ReleaseSafe dual WASM bundle linked successfully with these changes and the backend worker-startup fix.
• Chromium gameplay through first nightfall, 150 seconds each: three shared-memory asset workers with isolation; zero workers in the automatic non-isolated fallback. Both passed without runtime errors.

Pathfinding parallelism on web remains deferred until an asynchronous worker-budgeted job API is available.

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