run 22

docs/pt2-protocol-summary.md

@@ -240,6 +240,7 @@ confirmed Sony definition.
 | `07 80 FA 50 26 51` | host-shaped mirror of `07 80 E8 40 30 45`, seen once | low-medium | new structured response family on the `E8` branch; follow-up echo did not advance state |
 | `07 C0 7A 50 A6 11` | exact echo of `07 80 E8 40 30 45`, seen once | low | new structured response family on the `E8` branch; not yet repeated |
 | `07 80 7A 50 26 D1` | host-shaped `E8` branch, reproduced across HE8-HE11 group 1 | medium-high | reproducible downstream response family in the `E8` / `FA` / `7A` branch |
+| `07 80 7A 28 D3 5C` | host-shaped `E9` neighbor, group 1 | low-medium | nearby distinct `7A`-family response; suggests an `E8`/`E9` selector neighborhood |
 
 Current caution:
 
@@ -260,6 +261,9 @@ Current caution:
 - Directly echoing or host-mirroring `07 80 7A 50 26 D1` also did not advance
   the exchange; the active trigger still appears to be the host-shaped
   `00 00 E8 40 30 C2` step.
+- Nearby host-shaped neighbors are mixed rather than uniform:
+  `E9` produced a distinct `7A`-family response, while `E7` and `EA` steered
+  back toward known heartbeat-family transients.
 
 ## What We Know
 
@@ -284,6 +288,8 @@ Current caution:
   more like transient state/context responses than like camera-data streaming.
 - The most promising new echo-derived lead is now the `E8` / `7A` / `FA`
   response branch.
+- `E8` is not completely isolated: nearby `E9` can also open a `7A`-family
+  response, but with different payload bytes.
 
 ## What We Do Not Know