Extract canvas stroke commit and brush preset services

docs/modernization/tasks.md

@@ -91,7 +91,7 @@ Status: In Progress
 
 Why now:
 `src/canvas.cpp` is still the biggest single architectural blocker at about
-2592 lines.
+2122 lines.
 
 Current slice:
 - Canvas state-management helpers for picking, clear/clear-all, layer
@@ -112,6 +112,11 @@ Current slice:
   live in `src/legacy_canvas_object_draw_services.*` instead of staying inline
   in `src/canvas.cpp`, which trims another coherent object-draw and
   viewport-state execution pocket from the live canvas shell.
+- `Canvas::stroke_draw_samples(...)`, `Canvas::stroke_commit()`, and the
+  larger stroke sample/commit execution family now also live in
+  `src/legacy_canvas_stroke_commit_services.*` instead of staying inline in
+  `src/canvas.cpp`, which trims another large retained stroke-render pocket
+  from the live canvas shell.
 - Shared canvas-mode GL wrappers plus the `CanvasModeBasicCamera` and
   `CanvasModeCamera` input handlers now also live in
   `src/legacy_canvas_mode_helpers.*` instead of staying inline in
@@ -271,6 +276,10 @@ Current slice:
   route through `execute_node_canvas_draw_merged_pass(...)`, which trims
   another coherent merged draw-orchestration block from the live node even
   though the broader draw loop still remains inline.
+- `NodeCanvas::handle_event()` now also routes through the local
+  `execute_node_canvas_handle_event(...)` helper, which trims another coherent
+  input-routing block from `src/node_canvas.cpp` even though the node still
+  owns broader canvas/controller behavior.
 
 Write scope:
 - `src/node_stroke_preview.cpp`
@@ -299,7 +308,7 @@ Mini-model packet:
 
 #### ARC-RND-003 - Replace App-Facing `Texture2D`/`RTT` Use With Renderer API Contracts
 
-Status: Ready
+Status: In Progress
 
 Why now:
 Future Vulkan and Metal work needs the live app to stop treating retained
@@ -984,6 +993,11 @@ Current slice:
   `src/node_panel_brush.cpp`, which trims a coherent retained brush-workflow
   pocket from the live UI node even though cloud and package-worker ownership
   still remain separate follow-up work.
+- `NodePanelBrushPreset` save/restore plus PPBR/ABR import/export routing now
+  also lives in `src/legacy_brush_preset_services.*` instead of staying inline
+  in `src/node_panel_brush.cpp`, which trims another large preset-workflow
+  pocket from the live UI node even though the broader cloud/package worker
+  split still remains follow-up work.
 
 Write scope:
 - `src/legacy_cloud_services.*`