Record STR-056 closeout hash

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