* refactor(shell): one shell-argument-quoting module for the duplicated quote copies
Each former copy now calls the canonical function with its exact spelling; a table test pins
byte-identical output for every copy over hostile inputs. Distinct spellings stay distinct
functions: '\'' vs '"'"', the two plain-word sets, and the cmd.exe doubled quote.
Co-Authored-By: Claude <noreply@anthropic.com>
* style: keep the quoting import at the top of two import-less files
Co-Authored-By: Claude <noreply@anthropic.com>
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Co-authored-by: Claude <noreply@anthropic.com>