Record the clarity sweep and point the handoff at 7e2b4cd

docs/HANDOFF.md

@@ -6,8 +6,8 @@ found is in `docs/LAYOUT_LOG.md`.
 
 ## The Iris layout repair is submitted
 
-**Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `6c84b6f`,
-and past the reviewed `cadfba0` it is four rounds, each described in
+**Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `7e2b4cd`,
+and past the reviewed `cadfba0` it is five rounds, each described in
 `docs/LAYOUT_LOG.md`:
 
 - **The repair**, `add6774` and `84dad21` -- collapsed-share placement,
@@ -16,6 +16,9 @@ and past the reviewed `cadfba0` it is four rounds, each described in
 - **The vocabulary and the container API**, `5642f20` through `58ce74d`.
 - **Naming**, `55df32a` through `40b89c1`.
 - **A sweep over the logic those names exposed**, `8d2b7a5` and `6c84b6f`.
+- **A clarity sweep**, `3da1c71` and `7e2b4cd` -- naming the pairs layout
+  returns, `Span::slot`, and a diagnostic that printed the rel base while
+  calling it the box.
 
 The settled design of the last three is in `docs/LAYOUT.md` under "Three
 names, and the one argument that says them". Bryan settled the API over
@@ -35,7 +38,7 @@ the **cold dump**. `layout_dump` over 400 depth-5 trees is 34,492 boxes, and
 it is the only thing that catches two same-typed values being swapped, which
 is the failure mode of a rename or a move. The repair moved 650 of those
 boxes, all from the collapsed-share correction; every commit since has been
-byte-identical to `84dad21`.
+byte-identical to `84dad21`, the clarity sweep included.
 
 **Only when the change can alter what layout computes**: the three seed scans
 -- 400 at depth 5, 1,000 at depth 6, 2,000 at depth 4. They cost about a