wip(tracks): phase 5 - a print names its maker, and a read print points at the next one (the chain); goes with maroon-lake phase-5

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

packages/ludic.tracks/read.ludic

@@ -28,6 +28,7 @@ export function tracks_read(tracks_st: mut TracksState, slot: int) -> void {
   f.first = not t.read
   t.read = true
   tracks_note_bearing(tracks_st, t.yaw)
+  tk_chain_read(tracks_st, t)
   tk_push(tracks_st, f)
 }