zig

Use when requests involve Zig code or toolchain work: editing `.zig`, changing `build.zig`/`build.zig.zon`, running or fixing `zig build|test|run|fmt|fetch`, debugging compile/runtime/test failures, comptime/reflection/codegen, allocator ownership, SIMD (`std.simd`/`@Vector`), threads (`std.Thread`/`Thread.Pool`), cross-compilation, zero-copy parsing, or C interop (`@cImport`). Enforce correctness-first validation with tests, `std.testing.fuzz`, and allocation-failure checks.