Check in add-building dispatch corpus

docs/rehost-queue.md

@@ -326,6 +326,19 @@ Working rule:
     `Alternate USA.gmp` sits on the repeated three-row shape
     `[0:8:-25,0:8:0,0:8:0]`; that gives the next pass a simpler shape-level discriminator even
     when descriptor labels differ
+  - the shipped-map corpus is checked in now too:
+    `artifacts/exports/rt3-1.05/add-building-compact-dispatch-corpus.json` records the full
+    six-map add-building carrier set in bundled RT3 1.05 maps:
+    `Alternate USA`, `Chicago to New York`, `Louisiana`, `Pacific Coastal`,
+    `Rhodes Unfinished`, and `Texas Tea`. Across that corpus the normalized row-shape totals are
+    only four families:
+    `[0:8:-25,0:8:0,0:8:0] = 4`,
+    `[0:8:0,0:8:0,0:8:0,0:8:0] = 1`,
+    `[0:8:0,0:8:0,0:8:0] = 1`,
+    `[0:8:0] = 4`.
+    The accompanying signature/condition cluster totals now show the add-building carrier set is
+    broader than the first two sampled maps but still small enough to treat as a bounded compact
+    subfamily frontier rather than a diffuse generic event carrier.
   - the same probe now narrows the candidate runtime-effect set too:
     it reports which decoded records already carry grouped opcodes in the grounded
     `0x00431b20` dispatch strip; real `War Effort.gmp` currently narrows that to record indexes