diff --git a/docs/modernization/debt.md b/docs/modernization/debt.md
index d8b80da..28b5f61 100644
--- a/docs/modernization/debt.md
+++ b/docs/modernization/debt.md
@@ -18,6 +18,10 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Recent Reductions
 
+- 2026-06-14: `DEBT-0036` was narrowed again. `Canvas::stroke_commit()` now
+  routes the retained sequence plan assembly through
+  `make_canvas_stroke_commit_sequence_plan(...)`; the wrapper still owns the
+  request dispatch and commit sequencing.
 - 2026-06-14: `DEBT-0036` was narrowed again. `Canvas::stroke_commit()` now
   routes the retained request build and execution through
   `execute_canvas_stroke_commit_request(...)`; the wrapper still owns the
diff --git a/docs/modernization/tasks.md b/docs/modernization/tasks.md
index d307697..f84e327 100644
--- a/docs/modernization/tasks.md
+++ b/docs/modernization/tasks.md
@@ -2304,6 +2304,27 @@ Done Checks:
 - `docs/modernization/debt.md` records the reduced stroke-commit wrapper
   surface.
 
+### STR-056 - Extract Stroke Commit Plan Assembly
+
+Status: Done
+Score: no score movement
+Debt: `DEBT-0036`
+Scope: `src/canvas.cpp`, `tests/paint_renderer/stroke_execution_tests.cpp`
+Closeout: `7baf377c`
+
+Goal:
+
+Move the retained `Canvas::stroke_commit()` plan construction into a helper so
+the callsite only supplies current state and dispatches the result.
+
+Done Checks:
+
+- `Canvas::stroke_commit()` no longer builds the stroke-commit plan inline.
+- Regression coverage proves the helper preserves the plan fields used by the
+  retained commit request.
+- `docs/modernization/debt.md` records the reduced stroke-commit planning
+  surface.
+
 Validation:
 
 ```powershell