Extract canvas object draw and brush panel services

docs/modernization/roadmap.md

@@ -79,14 +79,14 @@ What is still carrying too much live ownership:
 
 Current hotspot files:
 
-- `src/canvas.cpp`: 2728 lines
+- `src/canvas.cpp`: 2592 lines
 - `src/app_layout.cpp`: 125 lines
-- `src/canvas_modes.cpp`: 1710 lines
+- `src/canvas_modes.cpp`: 1626 lines
 - `src/node.cpp`: 1368 lines
 - `src/main.cpp`: 271 lines
-- `src/node_panel_brush.cpp`: 1207 lines
+- `src/node_panel_brush.cpp`: 1094 lines
 - `src/node_stroke_preview.cpp`: 910 lines
-- `src/node_canvas.cpp`: 864 lines
+- `src/node_canvas.cpp`: 872 lines
 - `src/app.cpp`: 575 lines
 - `src/app_dialogs.cpp`: 168 lines
 
@@ -244,6 +244,18 @@ Current architecture mismatches that must be treated as real blockers:
   callback-assembly setup now also route through
   `execute_node_canvas_draw_unmerged_pass(...)`, which trims another coherent
   unmerged draw shell from the live node even though the file itself remains
+  large, while `NodeCanvas::draw()` merged-pass callback wiring and pass setup
+  now also route through `execute_node_canvas_draw_merged_pass(...)`, which
+  trims another coherent merged draw shell from the live node even though the
+  broader draw loop still remains inline,
+  while `Canvas::draw_objects_direct(...)` and `Canvas::draw_objects(...)` now
+  route through `src/legacy_canvas_object_draw_services.*` instead of staying
+  inline in `src/canvas.cpp`, which trims another coherent object-draw and
+  viewport-state execution family from the live canvas shell,
+  while `NodePanelBrush` save/restore/scan/reload/find/get-path ownership now
+  routes through `src/legacy_brush_panel_services.*` instead of staying inline
+  in `src/node_panel_brush.cpp`, which trims another retained brush-workflow
+  pocket from the live UI node even though the broader panel still remains
   large, while shared canvas-mode GL wrappers plus the
   `CanvasModeBasicCamera` and `CanvasModeCamera` input handlers now also route
   through `src/legacy_canvas_mode_helpers.*` instead of staying inline in