Function render_runtime_writes 

pub fn render_runtime_writes(writes: &[RuntimeWriteReport]) -> String

The Runtime writes block of mur run --explain-scope’s human rendering.

Ends with a newline. Shared with nothing else today, but kept beside the declaration for the reason crate::containment::render_read_only is kept beside its own: a second renderer is a second place for the wording to drift from the data.