Demote tier2 kind-8 header class signal

artifacts/exports/rt3-1.06/runtime-effect-kind8-tier2-setup-core-note.md

@@ -50,18 +50,64 @@ So `Louisiana.gmp` is currently unique among the shipped carrier set on the cand
 sentinel pair, while `Alternate USA.gmp` stays separately unique on the recognized
 `rt3-105-map-container-v1` header pair.
 
+## Wider map-corpus check
+
+A wider `compare-setup-payload-core` pass over all 41 bundled `rt3_105/maps/*.gmp` files changes
+the candidate-header read materially:
+
+- `(0x00000000, 0x00000000)` appears on 31 maps
+- `(0xcdcdcdcd, 0xcdcdcdcd)` appears on 9 maps
+- `(0x10000000, 0x00009000)` appears only on `Alternate USA.gmp`
+
+Current `0xcdcdcdcd / 0xcdcdcdcd` maps in that wider corpus:
+
+- `Argentina Opens Up.gmp`
+- `Britain.gmp`
+- `Crossing the Alps.gmp`
+- `Greenland Growing.gmp`
+- `Japan Trembles.gmp`
+- `Louisiana.gmp`
+- `Pacific NW.gmp`
+- `South East Australia.gmp`
+- `Spanish Mainline.gmp`
+
+So the candidate-header sentinel pair is no longer a plausible `Louisiana`-specific upstream
+explanation by itself.
+
+That wider read also matches the already checked atlas note in
+`post-load-generation-paintterrain-and-save-load-restore.md`: the candidate-availability table
+header scan had already narrowed the visible family to those same three stable
+`(header_word_0, header_word_1)` pairs, with the `0xcdcdcdcd` class behaving like reused
+source-family framing rather than a direct availability payload or a unique scenario-side trigger.
+
+One narrower outlier still survives that wider scan:
+
+- no other bundled `rt3_105` map matches the full current `Louisiana.gmp` setup-core tuple
+  `payload_word_0x14 = 1870`, `payload_byte_0x20 = 0x3a`, `payload_word_0x3b2 = 2`,
+  `candidate_header = 0xcdcdcdcd / 0xcdcdcdcd`
+- even the nearest header-class peers still diverge:
+  - `Argentina Opens Up.gmp`: same header pair, but `payload_word_0x14 = 1880`,
+    `payload_byte_0x20 = 0x57`, `payload_word_0x3b2 = 1`
+  - `Crossing the Alps.gmp`: same header pair, but `payload_word_0x14 = 1875`,
+    `payload_byte_0x20 = 0x8f`, `payload_word_0x3b2 = 1`
+  - `Spanish Mainline.gmp`: same header pair, but `payload_word_0x14 = 1876`,
+    `payload_byte_0x20 = 0xe3`, `payload_word_0x3b2 = 1`
+
 ## Current implication
 
 The upstream side of the Tier 2 strip is now bounded more tightly:
 
 - the current `Louisiana.gmp` recipe/runtime outlier status is not explained by `payload_word_0x3b2`
   alone, because `Chicago to New York.gmp` also carries `2`
-- but `Louisiana.gmp` does stand out on the candidate-header sentinel pair
+- and `Louisiana.gmp` no longer stands out on the candidate-header sentinel pair once the broader
+  41-map corpus is included
+- but `Louisiana.gmp` still keeps a unique combined setup-core tuple once the broader corpus is
+  included
 
 So the next Tier 2 upstream question is narrower:
 
-- whether the unique `0xcdcdcdcd / 0xcdcdcdcd` candidate-header state in `Louisiana.gmp` is
-  relevant to the coupled
+- whether `Louisiana.gmp`'s remaining upstream setup-core outlier is a more specific combination of
+  `payload_word_0x14`, `payload_byte_0x20`, and the sparse recipe/runtime profile, rather than the
+  coarse candidate-header class itself, in the coupled
   `0x00435630 / 0x00412d70 / 0x00412fb0 / 0x00412c10`
-  rebuild strip, or whether it is only another container-side artifact unrelated to the shipped
-  `Add Building Warehouse05` row.
+  rebuild strip.