run 27

docs/pt2-state-map.md

@@ -123,28 +123,37 @@ The strongest current "state map" behavior lives here. Certain host-side values
 look less like direct commands and more like selector/context entries that open
 different downstream response families.
 
-### S4: `A0`-Contexted Selector Space
+### S4: Context-Opened Selector Space
 
-Current best evidence says `A0` is not always just a neutral primer. On at
-least the `EC` and `E8` branches, it appears to be part of the context that
-opens the family space.
+Current best evidence says the selector surface is opened not by a single magic
+byte, but by a small family of host-side context setters.
 
 Observed:
 
 - `A0 + E8` can produce `7A 50 26` family output
 - `A0 + EC` tends to produce `7B`-family output
-- `E8` without `A0` fell back to `07 80 40 40 30 ED`
-- `E9` without `A0` also fell back to `07 80 40 40 30 ED`
-- `EC` without leading `A0` falls back to `07 80 C0 40 30 6D`
+- `90 + E8` produced `7A 50 26`
+- `90 + E9` produced `7A 28 D3`
+- `90 + EC` produced `7B 50 26`
+- `AF + E9` produced `7A 28 D3`
+- `AF + EC` produced `7B 50 26`
+- `AF + E8` produced the sibling `FA 50 26` family
+- bare heartbeat + `E8` produced `7A 50 26`
+- bare heartbeat + `E9` produced `7A 28 D3`
+- bare heartbeat + `EC` did not open `7B`; it stayed in heartbeat-family
+  behavior
 
 Nuance:
 
+- `A0` is not the only opener.
 - `A0` is not sufficient to make every selector deterministic.
 - A later control repeat of `A0 + E9` produced heartbeat only, even though
   earlier `A0 + E9` runs produced `07 80 7A 28 D3 5C`.
+- `EC` appears stricter than `E8/E9`, because heartbeat alone was enough for
+  `E8/E9` but not for `EC`.
 
-Confidence: high that `A0` is contextual; medium on the exact scope of that
-context.
+Confidence: high that a context-opener family exists; medium-high on the exact
+rules for each selector.
 
 ## `Ex` Selector Neighborhood
 
@@ -185,12 +194,18 @@ What we know:
 - reproducible in group 1
 - exact echo of `07 80 7A 50 26 D1` did not advance state
 - host-shaped mirror of `7A 50 26` did not advance state
+- opened by more than one context:
+  - `A0`
+  - `90`
+  - bare heartbeat
+- `AF` shifted this branch to sibling `FA 50 26 51`
 
 Read:
 
 - `E8` is the active selector
 - `7A 50 26 D1` is a downstream family response, not yet a meaningful next host
   turn
+- context affects which sibling family `E8` opens
 
 Confidence: medium-high
 
@@ -211,6 +226,10 @@ What we know:
 - without `A0`, `E9` fell back to `07 80 40 40 30 ED`
 - with `A0`, a later control repeat returned only heartbeat, so this branch is
   less deterministic than `E8`
+- also opened by:
+  - `90`
+  - `AF`
+  - bare heartbeat
 
 Read:
 
@@ -236,6 +255,8 @@ or
 Important details:
 
 - without leading `A0`, `EC` fell back to `07 80 C0 40 30 6D`
+- `90` and `AF` also opened `7B 50 26`
+- bare heartbeat alone did not
 - short and long spacing with `A0` still favored `07 80 7B 50 26 D0`
 - exact `7B` echo once produced:
   - `07 C0 2F 95 09 2E`
@@ -245,7 +266,7 @@ Important details:
 Read:
 
 - `EC` is the most stateful selector branch seen so far
-- `A0` seems to be part of its selection context
+- `EC` needs a stronger context class than plain heartbeat
 - `7B` is the most stable downstream family on this branch
 - `FB` is real but currently looks like a sibling observation, not a clear reply
   target
@@ -262,9 +283,9 @@ S1 host-present/cadence-held
 S2 discovery/query window
   -> selector/context entry
 S4 A0-contexted selector space
-    -> E8 -> B1 (7A 50 26 family)
+    -> E8 -> B1 (7A / FA family space)
     -> E9 -> B2 (7A 28 D3 family)
-    -> EC -> B3 (7B / FB family)
+    -> EC -> B3 (7B / FB family space)
     -> E6/E7/EB -> heartbeat-family transient
     -> EA / no-A0-EC -> C0-family transient
 ```