feat(engine): Tiled P3 — animated tiles (deterministic frame clock) + tile objects (#71)

- Animated tiles: a tileset <animation>'s {tileid, duration} frames advance as a
  pure function of the fixed 60/s engine frame counter (the same clock SpriteAnim
  rides), so an animated GID resolves at draw to the current frame's GID with its
  flip flags preserved — deterministic, frame-identical across runs, ticks for
  free. Tiled.frame_gid(map, gid, frame) / Tiled.animated(map, gid) expose it;
  Tiled.draw_anim(map, camx, camy, frame) draws a map with animations advanced.
- Tile objects: object-layer entries with a `gid` draw the tile image (with their
  own flip flags), bottom-anchored at the object position, as placeable sprites;
  tmap_draw_full now renders object layers alongside tile layers.

Proven by library/tiled_p3.ludic (14 assertions): frame advance at authored
durations + wrap, flip flags riding an animation swap, tile-object parse + draw +
flip mirroring, and the design's named rpg/beach_tileset.tsx (33 <animation>
blocks / 131 frames). x test: 94 passed.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

selfhost/backend/emit_call.ludic

@@ -621,6 +621,9 @@ function emit_ns_call(ns: pointer, meth: pointer, e: Node) -> Val {
     if (meth == "layer_count") { bare = "tmap_layer_count";  push(labels, "map") }
     if (meth == "layer_name")  { bare = "tmap_layer_name";   push(labels, "map"); push(labels, "index") }
     if (meth == "draw")        { bare = "tmap_draw";         push(labels, "map"); push(labels, "camx"); push(labels, "camy") }
+    if (meth == "draw_anim")   { bare = "tmap_draw_anim";    push(labels, "map"); push(labels, "camx"); push(labels, "camy"); push(labels, "frame") }
+    if (meth == "frame_gid")   { bare = "tmap_frame_gid";    push(labels, "map"); push(labels, "gid"); push(labels, "frame") }
+    if (meth == "animated")    { bare = "tmap_is_animated";  push(labels, "map"); push(labels, "gid") }
     if (meth == "project")     { bare = "tmap_project";      push(labels, "map"); push(labels, "layer") }
     if (meth == "collide")     { bare = "tmap_collide";      push(labels, "map"); push(labels, "layer") }
     if (meth == "collision_kind") { bare = "tmap_collision_kind"; push(labels, "map"); push(labels, "gid") }