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d7bf9d3898
Delete the old C++ ECMA-262 parser, optimizer, and matcher now that all in-tree users compile and execute through `ECMAScriptRegex`. Stop building the legacy engine, remove its source files and the POSIX-only fuzzers that depended on it, and update the remaining LibRegex tests to target the Rust-backed facade instead of the deleted implementation. Clean up the last includes, comments, and helper paths that only existed to support the old backend. After this commit LibRegex has a single ECMAScript engine in-tree, eliminating duplicated maintenance and unifying future regex work.