self-run: repair the task cut function

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

crates/mind-body/src/self_run.rs

@@ -133,8 +133,19 @@ fn task_section(mind: &dyn MindPort, claims: &[PipelineRef]) -> String {
     }
     cut_at(task, TASK_LIMIT)
 }
-/// `text` cut at a character boundary to `limit` bytes, marked when cut.fn cut_at(mut text: String, limit: usize) -> String {    if text.len() > limit {        let mut end = limit;        while !text.is_char_boundary(end) {            end -= 1;        }        text.truncate(end);        text.push_str("
-[task truncated]");    }    text}
+
+/// `text` cut at a character boundary to `limit` bytes, marked when cut.
+fn cut_at(mut text: String, limit: usize) -> String {
+    if text.len() > limit {
+        let mut end = limit;
+        while !text.is_char_boundary(end) {
+            end -= 1;
+        }
+        text.truncate(end);
+        text.push_str("\n[task truncated]");
+    }
+    text
+}
 
 /// What the child is told once, at the context ceiling.
 pub const FLUSH_MESSAGE: &str = "The context ceiling is reached. Admit to the mind what it lacks, close your run, and end.";