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Add uutils/sed to the playground alongside grep, find and diff/cmp. sed builds a single `sed` binary and, like diffutils, has only pure-Rust dependencies (fancy-regex and regex, not onig), so its WASM build needs no WASI SDK — it joins the wasm-standalone matrix with needs_wasi: false. Register sed as its own on-demand standalone module (sed -> sed.wasm), add it to the fallback command list, the help/load hints, a substitution example, the version footer, and tests (stdin substitution, global substitution over a file, and -n line selection).