Add animation panel action planner

docs/modernization/roadmap.md

@@ -500,6 +500,9 @@ adapter continues execution.
 frame add, duplicate, remove, duration adjustment, timeline moves, timeline
 goto/next/previous, onion-size updates, frame selection, no-reload playback
 stepping, and play-mode toggles used by the live animation panel.
+`pano_cli plan-animation-panel-action` exposes the higher-level animation panel
+state/action planner for goto, next, previous, playback-step, and play-toggle
+automation without requiring the legacy UI or canvas.
 Panel-control, timeline, selected-frame click, playback tick, and play-button
 toggle execution now dispatch through `DocumentAnimationServices` before the
 legacy `Canvas`/`Layer`/canvas-mode adapter continues.
@@ -1205,7 +1208,8 @@ Results:
   rejection, duration floor/overflow handling, timeline move edge behavior,
   goto/next/previous wrapping, onion-size rejection, service dispatch ordering,
   frame-click selection planning, no-reload playback step planning,
-  playback toggle start/stop planning, non-mutating duration no-ops, and
+  playback toggle start/stop planning, animation panel action planning,
+  invalid panel timeline state rejection, 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`,
@@ -1214,6 +1218,9 @@ Results:
   `pano_cli_plan_animation_operation_playback_smoke`,
   `pano_cli_plan_animation_operation_toggle_playback_start_smoke`,
   `pano_cli_plan_animation_operation_toggle_playback_stop_smoke`,
+  `pano_cli_plan_animation_panel_action_next_smoke`,
+  `pano_cli_plan_animation_panel_action_toggle_stop_smoke`,
+  `pano_cli_plan_animation_panel_action_rejects_bad_timeline`,
   `pano_cli_plan_animation_operation_rejects_remove_last_frame`, and
   `pano_cli_plan_animation_operation_rejects_bad_selection` passed and expose
   live animation-panel planning as JSON automation.