Record that Remap is temporary, to be deleted by region chaining

docs/IRIS_EXTRACTION_HANDOFF.md

@@ -9,7 +9,7 @@ Canonical `main` is **`43ce8c7`** (#12, pointer routing). Fourteen slices are
 in.
 
 - **#16** `split/16-draw-size`, worktree `/home/bob/repos/iris-pr16`, head
-  `53e6128`. A widget sizes itself while drawing; `SizeCtx`, the `desired_*`
+  `4654756`. A widget sizes itself while drawing; `SizeCtx`, the `desired_*`
   methods and the size cache are gone, and `on_resize(axis)` drives the
   retained path. Two review rounds answered: `Widget::draw` returns the `Size`
   (no `Painter::set_size`), both `place` methods are folded back into
@@ -41,6 +41,12 @@ a plausible number there instead of saying so; it and `outside` now return
 `Option`, and `Remap` is the checked region-level operation, so a drawing that
 cannot be taken out of its box is redrawn rather than left at its old size.
 
+`Remap` is explicitly a holding pattern: the owner accepted it on 2026-09-14
+with *"I don't like remap much but I'll let it in for now until we get proper
+region chaining"*. Delete it in the chaining slice rather than build on it --
+holding each part's own region against its box means there is no composition to
+invert and nothing for `Remap` to check.
+
 Counted draws on a resize, against the old wipe-everything: 101 widgets of
 padded rows went 101 -> 0, `tabs` 73 -> 0, and the `text` example 49 -> 48. The
 last is the shape that does not benefit -- both paragraphs rewrap to a different