Mark the rename step done and say what it renamed

The record's boxes are part, asked and placed, LayoutHolds carries window
ranges beside its two pins, and what is left of the layout plan is the
retained cost and the review of the branch as one diff.

docs/LAYOUT_LOG.md

@@ -95,7 +95,8 @@ Three rig changes came out of it, all kept:
   as a fraction of the wrong length agreed at the window it was made at and
   parted from cold at every other one.
 
-Checks at the end of the step (`23523ee`): `cargo fmt --all --check`, clippy
+Checks at the end of the step (`a30971e`, and `23523ee` before the rig and
+the renames): `cargo fmt --all --check`, clippy
 with and without `layout-diagnostics`, 122 suite tests, 20 core, 11
 generated, the 400-seed depth-5 shrinker over all sixteen cases, the
 1000-seed depth-6 oracle, and the 2000-seed depth-4 scan over all sixteen