Point the handoff at the current tip

docs/HANDOFF.md

@@ -6,10 +6,10 @@ in `docs/LAYOUT_LOG.md`.
 
 ## The Iris layout repair is submitted
 
-**Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `beb1386`:
+**Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `c55be21`:
 `add6774` fixes collapsed-share placement, retained mask ownership and a
 redraw-on-reparent defect, `84dad21` removes repeated work in the test
-harness, and `5642f20`, `aeb60e5` and `beb1386` are the vocabulary and API
+harness, and `5642f20` through `c55be21` are the vocabulary and API
 work below.
 The core design remains sound; round-to-nearest is still unchanged.