Document VR ownership and GLFW platform hooks

docs/modernization/debt.md

@@ -18,6 +18,20 @@ agent or engineer to remove them without reconstructing context from chat.
 
 ## Reductions
 
+- 2026-06-16: `DEBT-0036` was narrowed again. `NodeCanvas` merged-path
+  per-plane merged-texture draw execution now routes through
+  `execute_legacy_canvas_draw_merge_layer_texture(...)` instead of spelling out
+  the sampler bind, `TextureAlpha` setup, texture bind, draw, and unbind
+  inline in `NodeCanvas::draw()`; broader canvas draw orchestration remains.
+- 2026-06-16: `DEBT-0003` was narrowed again. Windows VR device ownership in
+  `src/main.cpp` now uses `std::unique_ptr<Vive>` instead of a raw global
+  `Vive*`; retained global VR state, Win32 message-loop ownership, and broader
+  app/runtime coupling remain.
+- 2026-06-16: `DEBT-0017` was narrowed again. Linux/Web GLFW render-context
+  acquire/present hooks and Linux app-close now route through retained local
+  GLFW callback hooks in `src/platform_legacy/legacy_platform_services.cpp`
+  instead of direct method-body `App::I` access; retained fallback platform
+  ownership and broader singleton reach remain.
 - 2026-06-16: `DEBT-0036` was narrowed again. `NodeCanvas` cache-to-screen
   checkerboard-plane callback setup now routes through
   `make_legacy_canvas_draw_merge_cache_to_screen_checkerboard_plane(...)` in