Revert "fix(ci): split oversized weekly rebuild matrix"

This reverts commit b75fd2f1c4.

.crow/weekly-rebuild-missing.yaml

@@ -1,7 +1,5 @@
-# Main weekly-rebuild-missing workflow (all slots except ubuntu-2604).
+# Consolidated weekly-rebuild-missing pipeline (all platforms, both arches).
 # Three matrix rows per OS/arch, one per shard of that slot's rebuild list.
-# ubuntu-2604 lives in weekly-rebuild-missing-ubuntu-2604.yaml so a manual
-# "all" run stays below Crow's 50-permutation matrix limit.
 # Routing is preserved 1:1:
 #   - cron:   each existing `weekly-rebuild-missing-<os>-<arch>` cron fires only
 #             its matching matrix rows (via the per-row `cron:` name filter),
@@ -348,6 +346,43 @@ matrix:
       IMG: ubuntu:noble
       SPLIT_INTO: 3
       SPLIT_INDEX: 3
+    - OS: ubuntu-2604
+      ARCH: amd64
+      R_VERSION: 4.4.3
+      IMG: ubuntu:resolute
+      SPLIT_INTO: 3
+      SPLIT_INDEX: 1
+    - OS: ubuntu-2604
+      ARCH: amd64
+      R_VERSION: 4.4.3
+      IMG: ubuntu:resolute
+      SPLIT_INTO: 3
+      SPLIT_INDEX: 2
+    - OS: ubuntu-2604
+      ARCH: amd64
+      R_VERSION: 4.4.3
+      IMG: ubuntu:resolute
+      SPLIT_INTO: 3
+      SPLIT_INDEX: 3
+    - OS: ubuntu-2604
+      ARCH: arm64
+      R_VERSION: 4.4.3
+      IMG: ubuntu:resolute
+      SPLIT_INTO: 3
+      SPLIT_INDEX: 1
+    - OS: ubuntu-2604
+      ARCH: arm64
+      R_VERSION: 4.4.3
+      IMG: ubuntu:resolute
+      SPLIT_INTO: 3
+      SPLIT_INDEX: 2
+    - OS: ubuntu-2604
+      ARCH: arm64
+      R_VERSION: 4.4.3
+      IMG: ubuntu:resolute
+      SPLIT_INTO: 3
+      SPLIT_INDEX: 3
+
 steps:
   - name: 'Rebuild missing binaries'
     image: reg.devxy.io/rpkgs/build-env-${IMG}