Extract preview dual pass live body

docs/modernization/debt.md

@@ -165,6 +165,10 @@ agent or engineer to remove them without reconstructing context from chat.
   `make_stroke_draw_immediate_main_live_pass_request(...)`; the retained path
   still owns the concrete frame mutation, sample shader setup, and final mixer
   unbind.
+- 2026-06-13: DEBT-0036 was narrowed again. `NodeStrokePreview::draw_stroke_immediate()`
+  now routes the dual-pass live body through
+  `execute_stroke_draw_immediate_dual_pass(...)`; the retained path still owns
+  the concrete frame mutation, shader setup, and preview copy behavior.
 - 2026-06-13: DEBT-0036 was narrowed again. `Canvas::draw_merge()` now routes
   the remaining per-layer branch orchestration through
   `execute_legacy_canvas_draw_merge_layer_composite(...)`; the retained path