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/HANDOFF.md

@@ -14,12 +14,12 @@ detached comparison checkout is `/home/bob/repos/iris-layout-baseline`. It is
 the reviewed baseline this work must preserve or improve.
 
 The continuation is `/home/bob/repos/iris-layout-experiment`, now on branch
-**`wip/one-ask`** at **`adbedaf`**, five commits over `4328eac` (the head of
+**`wip/one-ask`** at **`a30971e`**, six commits over `4328eac` (the head of
 `wip/transparent-frames`, which is unchanged). It replaces the old step 3
 plan with the one-ask protocol below, and `1512d84` and `23523ee` make the
 frame a length of the window. It passes every check:
 
-| check at `adbedaf` | result |
+| check at `a30971e` | result |
 | --- | --- |
 | `cargo fmt --all --check`, clippy `-D warnings`, with and without `layout-diagnostics` | clean |
 | `cargo test --workspace` (debug) | 122 suite, 20 core, 11 generated, all green |
@@ -41,8 +41,8 @@ reference gesture), `random` differs in two pixels of glyph antialiasing,
 `text` moves one padded block one pixel, and a live resize of `random`
 matches a cold render at that size byte for byte.
 
-Not done: the retained-cost work, the renames, and a pre-submit review of
-the five commits as one diff.
+Not done: the retained-cost work (step 5) and a pre-submit review of the six
+commits as one diff (step 1).
 
 The worker's older step 3/4 experiment is preserved as branch
 `wip/step3-experiment` (one commit over `4328eac`) and as
@@ -250,7 +250,7 @@ Unchanged; see `docs/LAYOUT.md`.
 ## Implementation plan
 
 Work in `/home/bob/repos/iris-layout-experiment` on `wip/one-ask` from
-`adbedaf`. Make each step a warning-clean commit and run its named checks
+`a30971e`. Make each step a warning-clean commit and run its named checks
 before the next. If a step exposes a different mechanism, stop and update
 this handoff rather than papering over it.
 
@@ -260,11 +260,11 @@ frame, ask, box and size warm against cold), pinned as a named test in
 `tests/cases/unsettled.rs`, then fixed under the two rules above. Do not add
 a second draw back.
 
-### 1. Review the five commits
+### 1. Review the six commits
 
-Run the pre-submit review over the five commits as one diff against
+Run the pre-submit review over the six commits as one diff against
 `4328eac`. `1512d84` rewrote much of what the first two did to `painter.rs`
-and `render_state.rs` and was reviewed as it was written, but the five have
+and `render_state.rs` and was reviewed as it was written, but the six have
 never been read as one change, and the parts of the one-ask protocol it did
 not touch -- `place_at`, the twice-asked deferral, `Span`'s two passes --
 were written as a probe and reviewed only by their tests.
@@ -286,15 +286,14 @@ placed by re-expression rather than by a second draw is what shows first.
 
 ### 4. Rename and delete
 
-Rename `ActiveData::offer_part` to `part`, `offer_place` to `asked`, `place`
-to `placed`, and `DrawInfo` likewise; delete `ActiveData::measured` in favour
-of reading `answer`; delete `answers_at` if `resize` is its only caller and
-inline it. Rename `LayoutHolds::frame` to `window` and `Painter::frame_own`
-with it: since `1512d84` those ranges are window pixels, and the only thing
-that writes them is `Painter::window_holds`; the frame's own entry is the
-`frame_len` pin beside it. Every use was written against the old names on
-purpose to keep the probe's diff readable; do this as one mechanical commit.
-Suite, oracle.
+**Done at `a30971e`.** `ActiveData` and `DrawInfo` now say `part` for the box
+a widget was asked in, `asked` for the place it was asked at and `placed` for
+where its drawing was put; `LayoutHolds::frame` is `window`, since those
+ranges are window pixels and the frame's own entry is the `frame_len` pin
+beside them, and `Painter::frame_own` is `window_own`. `answers_at` had one
+caller and is inlined there. `ActiveData::measured` is kept: `place_in` reads
+it, and what it says -- the answer rather than the last drawing's report --
+is worth a name.
 
 ### 5. Restore the expected retained cost