Add animation panel service boundary

docs/modernization/roadmap.md

@@ -499,7 +499,9 @@ adapter continues execution.
 `pano_cli plan-animation-operation` exposes app-core planning for animation
 frame add, duplicate, remove, duration adjustment, timeline moves, timeline
 goto/next/previous, and onion-size updates used by the live animation panel
-before legacy `Canvas`/`Layer` frame execution continues.
+Panel-control and timeline execution now dispatch through
+`DocumentAnimationServices` before the legacy `Canvas`/`Layer` adapter
+continues.
 `pano_cli plan-brush-operation` exposes app-core planning for brush color
 changes, tip/pattern/dual texture changes, preset brush replacement, and stroke
 settings refreshes used by the live brush, quick, color, and floating panel
@@ -1200,7 +1202,8 @@ Results:
 - `pp_app_core_document_animation_tests` passed, covering animation frame
   add/duplicate/remove planning, selected-frame rejection, last-frame remove
   rejection, duration floor/overflow handling, timeline move edge behavior,
-  goto/next/previous wrapping, and onion-size rejection.
+  goto/next/previous wrapping, onion-size rejection, service dispatch ordering,
+  non-mutating duration no-ops, and malformed execution payload rejection.
 - `pano_cli_plan_animation_operation_add_smoke`,
   `pano_cli_plan_animation_operation_duration_floor_smoke`,
   `pano_cli_plan_animation_operation_next_wrap_smoke`, and