docs(remote): a frame that starts on a wrapped line's second half is not placed (#609 merge-time fix)

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/tmux-manager.ts

@@ -737,7 +737,9 @@ function capturedRowText(row: string): string {
  * a live region (spinner, composer, footer) pinned to the bottom and inserts new
  * rows above it, so the frame is not a shifted copy of the screen and the
  * comparison down to the screen's last content row fails. The caller then falls
- * back to the plain join. A plain shell places.
+ * back to the plain join. A plain shell places, unless the frame starts on the
+ * second half of a wrapped line: -J holds that line as one screen row, so it
+ * matches nothing and the plain join applies too.
  */
 export function findFrameInScreen(screenRows: string[], frameRows: string[]): number {
   const screen = screenRows.map(capturedRowText);