💡 Codex Review

Escape newline in generated pandas example

The pandas_example template emitted by build_code_guidance is syntactically invalid because strings like "print('결측 비율 상위:\n', ...)" are interpreted while building the template, so the generated code contains a literal newline inside a single-quoted Python string and raises SyntaxError when users run it. This breaks one of the main outputs of multi-analyze (code_guidance.pandas_example) in normal usage.

Sanitize column names before composing chart paths

Chart filenames are built with raw CSV header values ({col}), so headers containing path separators or OS-reserved filename characters (for example a/b or a:b) produce invalid/nested output paths and can make savefig fail with filesystem errors during multi-analyze --charts-dir. Because this failure is not guaranteed to be a RuntimeError, it can abort chart generation and the command flow for otherwise valid CSV data.