Retain bigint/directive values, assignment operators, fixed public keys and
execution-affecting syntax flags in v3. Preserve local/private binding renames
and isolate structural matching by algorithm version. Remove the redundant
test grouping and document structural matching as heuristic evidence.
Validated AST, worker admission, archived-version matching, reconstruction and
public CLI comparisons. Auto-accessors are tested at the AST boundary because
the production JavaScript parser does not enable their Babel plugin.
Refs #3952, #4020.
Co-authored-by: ShitK <1724059440@qq.com>
