story-kit: merge 267_story_mcp_update_story_tool_should_support_front_matter_fields

server/src/io/story_metadata.rs

@@ -161,7 +161,7 @@ fn remove_front_matter_field(contents: &str, key: &str) -> String {
 /// Insert or update a key: value pair in the YAML front matter of a markdown string.
 ///
 /// If no front matter (opening `---`) is found, returns the content unchanged.
-fn set_front_matter_field(contents: &str, key: &str, value: &str) -> String {
+pub fn set_front_matter_field(contents: &str, key: &str, value: &str) -> String {
     let mut lines: Vec<String> = contents.lines().map(String::from).collect();
     if lines.is_empty() || lines[0].trim() != "---" {
         return contents.to_string();