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* fix(sandbox): keep line endings in local sandbox reads, writes and str_replace LocalSandbox opened files in text mode with the default newline=None. Reads translated CRLF to LF, so str_replace on a CRLF file rewrote every line as LF and the read-before-write hash missed newline-only changes; on Windows, writes turned LF content into CRLF (breaking `bash run.sh`). Read with newline="\n" and write with newline="", keeping line endings as stored like the remote providers; reads still end lines only at "\n", the rule count_file_lines and the truncation marker number lines by. str_replace spells an LF-written old_str/new_str with CRLF when the file uses it, so multi-line edits still match CRLF files on any provider. The tool-output budget middleware wrote externalized output the same way: on Windows the file no longer matched its stamped blob ref and the next model call deleted it when no blob store was configured. It now writes with newline="" too. * docs(changelog): reference #6343 for the line-ending fix * fix(sandbox): end local grep lines where read_file does find_grep_matches still opened files with universal newlines, so a bare "\r" split a line for grep but not for LocalSandbox.read_file, and a hit's line_number stopped matching the start_line that reads it back. Read with newline="\n" like read_file, and fold a CRLF terminator back to "\n" so $-anchored patterns keep matching CRLF lines as before.