Record the seventh sweep, over the rigs and the sixth sweep's own fix

Six findings in iris f8aa0c5, and the seven things that tripped a rule and
were left. Three of those are named as work waiting for the pre-review-gate
pass, since they pre-date #19 and are outside its diff.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

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 `b7b8d09`,
-and past the reviewed `cadfba0` it is eight rounds, each described in
+**Iris PR #19** (`layout/one-ask`) replaces closed #18. The tip is `f8aa0c5`,
+and past the reviewed `cadfba0` it is nine rounds, each described in
 `docs/LAYOUT_LOG.md`:
 
 - **The repair**, `add6774` and `84dad21` -- collapsed-share placement,
@@ -32,10 +32,16 @@ and past the reviewed `cadfba0` it is eight rounds, each described in
   two constants the shader and the CPU both count in written twice, and a
   `Scroll` positioning content the framework positions, which cost a redraw
   at the default alignment.
+- **A sweep over the rigs, `Fixed`, and `b7b8d09` itself**, `f8aa0c5` -- the
+  other half of that same `Scroll` test, which could never decide it; a grid
+  conversion and its helper that only their own test called; `Len`
+  arithmetic written a component at a time; a question asked through a value
+  one line from its `&self` sibling; and `run-headless.sh --resize` leaving
+  a replayed gesture scaled against the mode the output used to have.
 
-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
-2026-09-17 to 19; it is current, not frozen.
+The settled design of the vocabulary rounds is in `docs/LAYOUT.md` under
+"Three names, and the one argument that says them". Bryan settled the API
+over 2026-09-17 to 19; it is current, not frozen.
 
 The core design remains sound. Round-to-nearest is still unchanged.
 
@@ -105,16 +111,22 @@ a compile error, which reads exactly like a fuzzer failure.
 1. **Bryan's review of #19.** Fixes are themselves unreviewed code: repeat
    `pre-submit-review` over each round's changes, and apply the gate above to
    whatever each one touched. The ordinary oracle does not replace absolute
-   geometry and retained-primitive expectations.
+   geometry and retained-primitive expectations. The seventh sweep is the
+   evidence: reading `b7b8d09`, the sixth sweep's own fix, found that it had
+   removed one dead operand from a test and left the one beside it.
 2. **A review of everything written before the review gate existed.**
    `pre-submit-review` and the rule that nothing is submitted unreviewed
    arrived on 2026-09-13, well after the Rust port and most of Iris were
-   written, so all of that code went in unreviewed and none of the five
-   sweeps above covered more than the layout branch. It wants a pass of its
-   own (Bryan, 2026-09-20). The surface-texture defect in `02048ea` is the
+   written, so all of that code went in unreviewed and none of the sweeps
+   above covered more than the layout branch. It wants a pass of its own
+   (Bryan, 2026-09-20). The surface-texture defect in `02048ea` is the
    argument: nothing about that arm was hard, and it was written wrong
    anyway, which is what a first reader catches and a later sweep of some
-   other subject does not.
+   other subject does not. Three things it already has waiting, left out of
+   #19 because they are outside its diff: `Align::tuple` and both
+   `partial_align`s have no callers, `Vec2::align`/`partial_align` are
+   `UiVec2`'s with a conversion in front, and `impl_op!` carries four
+   grammars of which `core/src/util/vec2.rs` uses two, one line apart.
 3. **Integrate the app's Iris capabilities before changing its pin.**
    `32f6ad8` has 45 commits not reachable from the review branch; shared UI
    ownership, richer masks, Android support, and app-side performance work