fix(stats): flush transcript appends for CI (OpenCoven#119)

Signed-off-by: Timothy Wayne Gregg <Timothy.Gregg@complete.tech>

Author: CompleteDotTech

src-rust/crates/core/src/session_storage.rs

@@ -321,6 +321,7 @@ pub async fn write_transcript_entry(path: &Path, entry: &TranscriptEntry) -> cra
         .await?;
 
     file.write_all(line.as_bytes()).await?;
+    file.flush().await?;
     Ok(())
 }