only tick nonwaiting objects

docs/script-api.md

@@ -37,12 +37,17 @@ fn init(me, state) {
 
 ### `fn tick(me, state, dt)`
 
-Called every frame. `dt` is the elapsed time since the last tick, in seconds (a `f64`). Timed
-actions pace themselves through the queue; you do not track time manually for simple walking.
+Called each frame **only when this object's output queue is empty** — i.e. once its previous
+actions (and any pacing `Delay`) have fully drained. While actions from an earlier tick are still
+pending, the engine just advances the queue by `dt` and does **not** re-run `tick`. This means you no
+longer need to guard the body with `if me.queue.length == 0` / `if !me.waiting` — the engine does it
+for you, so a plain `move(North)` naturally paces itself one step per drain. `dt` is the elapsed time
+since the last tick, in seconds (a `f64`). (All other hooks — `bump`/`enter`/`grab`/`send`/`init` —
+still fire regardless of queued actions.)
 
 ```rhai
 fn tick(me, state, dt) {
-    if !me.waiting && !me.blocked(North) {
+    if !me.blocked(North) {
         move(North);
     }
 }