fix(render3d): a rim from outline_model goes out when the caller stops asking

The queue was only emptied by the next outline_model call, so the last highlighted tree kept
its rim after the player looked away. r3d_frame now calls outline_frame, which drops a batch
the previous frame closed and nobody reopened.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

changes/outline-queue-stale.md

@@ -0,0 +1,6 @@
+bump: patch
+type: fix
+**A rim from `outline_model` no longer stays on after the caller stops asking** — the queue
+was only emptied by the next `outline_model` call, so a game that highlights what the
+crosshair is on left the last highlighted tree outlined for good once the player looked
+away. `r3d_frame` now drops a batch nobody reopened this frame (`outline_frame`).

packages/ludic.render3d/actor.ludic

@@ -230,6 +230,11 @@ function outline_model(m: Model, mat: words, width: int, r: int, g: int, b: int)
   ac_oq_n += 1
 }
 function outline_clear() -> void { ac_oq_n = 0;  ac_oq_closed = true }
+# Called at the top of every frame. A batch the last frame closed and nobody has reopened
+# since is stale: the caller stopped asking. Without this it was drawn for ever - flush
+# closes a batch but only the NEXT outline_model call empties it, so looking away from a
+# highlighted tree left its rim on until something else was highlighted.
+function outline_frame() -> void { if ac_oq_closed { ac_oq_n = 0 } }
 
 function actor_draw() -> void {
   if ac_actors == null { return }

packages/ludic.render3d/render.ludic

@@ -124,6 +124,7 @@ function r3d_resize() -> void {
   print(`r3d: resized to {gl_w}x{gl_h}`)
 }
 function r3d_frame(time: int) -> void {
+  outline_frame()
   if not r3d_ready { return }
   if gl_resize_check() { r3d_resize() }
   # R3D_RESIZE_AT=<frame>: rebuild every screen-sized buffer mid-run, as a window resize