Extract stroke commit sequence invocation

docs/modernization/debt.md

@@ -119,6 +119,9 @@ agent or engineer to remove them without reconstructing context from chat.
   now routes the retained commit request assembly through
   `make_legacy_canvas_stroke_commit_request(...)`, leaving the callsite with
   only concrete faces, sequence, and callbacks.
+- 2026-06-13: `DEBT-0036` was narrowed again. `Canvas::stroke_commit()`
+  now routes the retained sequence invocation through a local helper,
+  leaving the callsite with only the built commit state.
 - 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.

docs/modernization/tasks.md

@@ -1284,6 +1284,12 @@ Validation:
 ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_stroke_execution|pp_paint_renderer_compositor" --output-on-failure
 ```
 
+### Completed Task Log
+
+| Date | Task | Score | Validation | Commit |
+| --- | --- | --- | --- | --- |
+| 2026-06-13 | STR-015 | +1 renderer boundary and OpenGL parity | `ctest --preset desktop-fast --build-config Debug -R "pp_paint_renderer_stroke_execution|pp_paint_renderer_compositor" --output-on-failure` | `pending` |
+
 ### STR-011 - Extract Preview Main Pass Orchestration
 
 Status: Done

src/canvas.cpp

@@ -790,6 +790,14 @@ glm::vec4 Canvas::stroke_draw_samples(
     return result.dirty_bounds;
 }
 
+template <typename BuildRequest>
+static auto execute_canvas_stroke_commit_sequence(
+    BuildRequest&& build_request)
+{
+    return pp::panopainter::execute_legacy_canvas_stroke_commit_sequence(
+        build_request());
+}
+
 std::vector<Canvas::StrokeFrame> Canvas::stroke_draw_compute(Stroke& stroke) const
 {
     auto samples = stroke.compute_samples();
@@ -1339,8 +1347,10 @@ void Canvas::stroke_commit()
         pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 5, .dirty = m_dirty_face[5] },
     };
 
-    [[maybe_unused]] const auto commit_result = pp::panopainter::execute_legacy_canvas_stroke_commit_sequence(
-        pp::panopainter::make_legacy_canvas_stroke_commit_request(faces, sequence, commit_callbacks));
+    [[maybe_unused]] const auto commit_result = execute_canvas_stroke_commit_sequence(
+        [&]() {
+            return pp::panopainter::make_legacy_canvas_stroke_commit_request(faces, sequence, commit_callbacks);
+        });
 }
 
 void Canvas::stroke_commit_timelapse()

tests/paint_renderer/compositor_tests.cpp

@@ -2021,6 +2021,50 @@ void retained_stroke_commit_request_helper_preserves_dirty_face_order(pp::tests:
     PP_EXPECT(h, request.faces[4].dirty);
 }
 
+void retained_stroke_commit_sequence_executor_preserves_request_shape(pp::tests::Harness& h)
+{
+    const pp::panopainter::LegacyCanvasStrokeCommitCallbacks callbacks {
+        .mark_commit_started = []() {},
+        .capture_render_state = []() {},
+        .prepare_render_state = []() {},
+        .restore_render_state = []() {},
+        .publish_history = []() {},
+        .capture_timelapse_frame = []() {},
+        .bind_layer_framebuffer = [](int) {},
+        .capture_history_region = [](int) {},
+        .apply_layer_dirty_region = [](int) {},
+        .copy_layer_to_commit_destination = [](int) {},
+        .bind_commit_inputs = [](int) {},
+        .execute_erase_composite = [](int) {},
+        .execute_paint_composite = [](int) {},
+        .copy_committed_to_dilate_source = [](int) {},
+        .execute_commit_dilate = [](int) {},
+        .unbind_layer_framebuffer = [](int) {},
+    };
+    const auto sequence = plan_canvas_stroke_commit_sequence(
+        CanvasStrokeCommitRequest {
+            .erase_mode = false,
+            .alpha_locked = false,
+            .selection_mask_active = true,
+            .dual_stroke_enabled = true,
+            .pattern_enabled = true,
+        });
+    const std::array<pp::panopainter::LegacyCanvasStrokeCommitFace, 6> faces {
+        pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 0, .dirty = true },
+        pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 1, .dirty = true },
+        pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 2, .dirty = false },
+        pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 3, .dirty = false },
+        pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 4, .dirty = true },
+        pp::panopainter::LegacyCanvasStrokeCommitFace { .index = 5, .dirty = false },
+    };
+
+    const auto result = pp::panopainter::execute_legacy_canvas_stroke_commit_sequence(
+        pp::panopainter::make_legacy_canvas_stroke_commit_request(faces, sequence, callbacks));
+
+    PP_EXPECT(h, result.ok);
+    PP_EXPECT(h, result.committed_faces == 3);
+}
+
 void retained_stroke_commit_dilate_copy_uses_layer_scratch_slot(pp::tests::Harness& h)
 {
     const auto sequence = plan_canvas_stroke_commit_sequence(