Record both review rounds answered, and what alignment now follows

docs/IRIS_EXTRACTION_HANDOFF.md

@@ -9,13 +9,27 @@ Canonical `main` is **`43ce8c7`** (#12, pointer routing). Fourteen slices are
 in.
 
 - **#16** `split/16-draw-size`, worktree `/home/bob/repos/iris-pr16`, head
-  `f192f75`. A widget sizes itself while drawing; `SizeCtx`, the `desired_*`
-  methods and the size cache are gone, and `size_dependence(axis)` drives the
-  retained path. `tabs`, `view` and `minimal` render byte-identical to `main`.
+  `9520996`. A widget sizes itself while drawing; `SizeCtx`, the `desired_*`
+  methods and the size cache are gone, and `on_resize(axis)` drives the
+  retained path. One review round answered: `Widget::draw` returns the `Size`
+  (no `Painter::set_size`), both `place` methods are folded back into
+  `widget_within`/`draw_inner`, `Painter::size_hint` records the size
+  dependency `place` used to, and `()` sizes itself rest so it is a gap.
+  `tabs` (all five tabs, and a replay that adds two images), `view` and
+  `minimal` render byte-identical to `upstream/main`.
 - **#17** `split/17-headless-rig`, worktree `/home/bob/repos/iris-pr17`, head
-  `9d13f15`. The compositor script, `rig-input`'s `replay-touch` and the
+  `deb9c1b`. The compositor script, `rig-input`'s `replay-touch` and the
   `.touch` parser, so a rendering claim no longer has to be checked from
-  ai-app's checkout. Small, and disjoint from #16.
+  ai-app's checkout. One review round answered: machine-specific prose out of
+  the comments, and `sway`/`swaymsg`/`grim` detected up front. Small, and
+  disjoint from #16.
+
+**Waiting on the owner:** whether size dependencies should be recorded per
+axis. They could be, but `highest_reader`'s only trigger is `needs_redraw`,
+which carries no axis, so the precision would be unusable until the trigger
+changes: redraw a child first, compare its new size to the old, and propagate
+only to readers of the axes that moved. Offered on #16 as its own slice, ahead
+of the position chain.
 
 Check for a review before starting anything, and read the newest
 `submitted_at` rather than the first result:
@@ -90,24 +104,13 @@ Other standing instructions from the owner:
 
 ## The next slice
 
-**Widget draw size and measurement** (source commit `6671194`), because it
-reaches furthest: `desired_width`/`desired_height` and `SizeCtx` go, a widget
-sizes itself during `draw` with `painter.set_size`, and `size_hint` is the
-cheap answer for a parent that needs a size without drawing. Every widget's
-body changes, so anything written before it is written twice. It also deletes
-the separate measurement recursion and its cache.
+**Built-in alignment** — see the first entry below. #16 and #17 are both
+waiting on review, and the alignment slice is disjoint from either.
 
-It is testable now that `iris::harness` is in: `tests/layout.rs` is where the
-acceptance goes.
-
-Two things to settle with the owner before writing it. The archive's `Widget`
-grows five methods — `size_hint`, `is_size_independent`, `requires_exact_region`,
-`access_role` and `child_order`; only the first three are sizing, and she
-dislikes capability methods on the core trait, so `requires_exact_region` in
-particular wants justifying (`Pad` sets it and then clears it when the content
-fits, which reads as a workaround). And the archive writes all of it against
-`LayoutLen` and `density`, which canonical does not have — recreate it on
-today's `Len` and let the dp slice follow, rather than pulling both in at once.
+The archive is not a patch here: it writes `Widget::draw` against
+`painter.set_size`, which #16 replaced with a returned `Size`, and it writes
+lengths against `LayoutLen` and `density`, which canonical does not have.
+Recreate on today's `Len` and let the dp slice follow.
 
 Still in the target, roughly in dependency order:
 
@@ -128,8 +131,8 @@ Still in the target, roughly in dependency order:
   content, which otherwise has to say `Redraw` because only its own draw knows
   where the middle was.
 
-  Size is the harder half: a declared size beside `set_size` is two sources of
-  truth for one thing, so settle what each means before building it.
+  Size is the harder half: a declared size beside the one `draw` returns is two
+  sources of truth for one thing, so settle what each means before building it.
 - **The position chain** (LAYOUT.md §2): `UiData::move_offsets`, per-primitive
   slot ids and a bounded chain walk in WGSL, so moving a subtree writes one
   slot instead of every descendant's primitives.