Summary

• Automatically trims trailing whitespace from all output lines in generated markdown
• Removes trailing empty lines from output blocks while preserving internal empty lines
• Ensures cleaner, more consistent output formatting

Changes

• Modified execute_code() to strip trailing newlines before splitting output
• Updated _process_output_start() to trim trailing whitespace from each line and remove trailing empty lines
• Added comprehensive pytest tests covering Python, Bash, and hidden code blocks

Test plan

• Added unit tests for Python code blocks with trailing whitespace
• Added unit tests for Bash code blocks with trailing whitespace
• Added unit tests for hidden code blocks with trailing whitespace
• Verified that internal empty lines are preserved for proper formatting
• Confirmed trailing empty lines are removed from output blocks
• All existing tests pass