# PR #4590 round 2 — asymmetric container evidence

Minimal evidence for the remaining `isFullBleed` finding at exact head
`f0422bfac22eabd2f710bb650ed1e1274b73f14e`. This directory contains one
decisive LTR exact-head/control pair and the matching RTL control pair — no
additional gallery.

## Files

| Direction | Exact head | Per-edge arm | Sensor receipts |
|---|---|---|---|
| LTR | [`exact-head-ltr.png`](exact-head-ltr.png) | [`per-edge-arm-ltr.png`](per-edge-arm-ltr.png) | [`head`](exact-head-ltr.sensors.json) · [`arm`](per-edge-arm-ltr.sensors.json) |
| RTL | [`exact-head-rtl.png`](exact-head-rtl.png) | [`per-edge-arm-rtl.png`](per-edge-arm-rtl.png) | [`head`](exact-head-rtl.sensors.json) · [`arm`](per-edge-arm-rtl.sensors.json) |

## Receipt parity

| Sensor | Exact head | Per-edge arm | Pass? |
|---|---|---|---|
| Build | `f0422bfac22eabd2f710bb650ed1e1274b73f14e` | same SHA + [`per-edge-arm.diff`](per-edge-arm.diff) | yes |
| Story | `zzreview-list4590r3--asymmetric` | same | yes |
| Theme / mode | `review-4590-evidence` / light | same | yes |
| Direction | LTR pair: LTR; RTL pair: RTL | same per pair | yes |
| Viewport / media | 920×540@1; forced-colors off; reduced-motion off; fine pointer; hover | same | yes |
| Rendered state | `asymmetric-16-4:enabled=true:rows=1:selected=1` | same | yes |
| Subject geometry | `[data-capture]` at x=16, y=16, 888×172.28125; visible and inside viewport | same | yes |
| Settled / errors | fonts loaded; 0 animations; no Storybook or page error | same | yes |
| Image | LTR `aa58acea…`; RTL `a65f3365…` | LTR `9a34acf0…`; RTL `b1d9af4a…` | nonblank, 920×540 |

The expected sensor values were authored before capture. The published JSON
receipts preserve every expected and observed sensor value; only the two local
filesystem fields (`build.root` and `image.path`) were rewritten to portable
commit/relative-path values for the wiki.

## Result

| Direction | Exact head | Per-edge arm |
|---|---|---|
| LTR | margins −8px / −8px; label aligned; logical-end spill 2px | margins −8px / −4px; label aligned; spill 0 |
| RTL | same logical-end spill, mirrored physically | same correction, spill 0 |

The pixel difference is confined to a 14×56 strip at logical end (252 pixels)
in each direction.

## Exact arm delta

[`per-edge-arm.diff`](per-edge-arm.diff) is the inspected production delta;
unrelated production delta: none.

```diff
 fullBleed: {
-  marginInline:
+  marginInlineStart:
     'calc(-1 * min(var(--_item-inset-inline), var(--container-padding-inline-start, 0px)))',
+  marginInlineEnd:
+    'calc(-1 * min(var(--_item-inset-inline), var(--container-padding-inline-end, 0px)))',
 },
```