Extract preview final composite wrapper

docs/modernization/debt.md

@@ -18,6 +18,9 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-13: `DEBT-0036` was narrowed again. `NodeStrokePreview::draw_stroke_immediate()`
+  now routes final composite execution and preview copy-back through a retained
+  local wrapper, leaving the call site with only sequence wiring.
 - 2026-06-13: `LATER-003` was narrowed again. `Canvas::stroke_draw()` now
   routes dual-brush tip dispatch through retained helper overloads, so the
   face-index callback wiring is no longer built inline in the dual-pass

docs/modernization/tasks.md

@@ -575,6 +575,9 @@ Done Checks:
 
 Progress Notes:
 
+- 2026-06-13: `NodeStrokePreview::draw_stroke_immediate()` now routes final
+  composite execution and preview copy-back through a retained local wrapper,
+  leaving the call site with only sequence wiring.
 - 2026-06-13: `Canvas::stroke_draw()` now routes dual-brush tip dispatch
   through retained helper overloads, so the face-index callback wiring is no
   longer built inline in the dual-pass branch.

src/node_stroke_preview.cpp

@@ -205,10 +205,21 @@ void execute_stroke_preview_final_composite_pass(const StrokePreviewCompositePas
                 .draw_composite = [&] {
                     inputs.draw_composite();
                 },
-            });
+    });
     assert(composite_ok);
 }
 
+void copy_stroke_preview_result_to_texture(Texture2D& texture, glm::vec2 size);
+
+void execute_stroke_preview_final_composite_and_copy(
+    const StrokePreviewCompositePassInputs& inputs,
+    Texture2D& preview_texture,
+    glm::vec2 size)
+{
+    execute_stroke_preview_final_composite_pass(inputs);
+    copy_stroke_preview_result_to_texture(preview_texture, size);
+}
+
 void copy_stroke_preview_framebuffer_to_texture(
     Texture2D& texture,
     glm::vec2 size,
@@ -838,7 +849,7 @@ void NodeStrokePreview::draw_stroke_immediate()
             },
             .finish_main_pass = [&] {},
             .execute_final_composite = [&] {
-                execute_stroke_preview_final_composite_pass(
+                execute_stroke_preview_final_composite_and_copy(
                     StrokePreviewCompositePassInputs {
                         .resolution = size,
                         .pattern_scale = patt_scale,
@@ -852,11 +863,11 @@ void NodeStrokePreview::draw_stroke_immediate()
                         .draw_composite = [&] {
                             m_plane.draw_fill();
                         },
-                    });
-            },
-            .copy_preview_result = [&] {
-                copy_stroke_preview_result_to_texture(m_tex_preview, size);
+                    },
+                    m_tex_preview,
+                    size);
             },
+            .copy_preview_result = [&] {},
         });
     assert(sequence_ok);