Aggregate the whole suite wiki onto the Institution page

Wiki/Home.md is the suite's front door; every layer's wiki now mirrors here
under Wiki/<layer>/ (core, contraband, justice, gangs, ward), so the whole
suite reads in one place with the index linking to the local pages. The
layer repos stay canonical -- Tools/sync-wiki.sh refreshes the aggregated
copy on demand. The README's main page points to it.

Tools/sync-wiki.sh

@@ -0,0 +1,41 @@
+#!/usr/bin/env bash
+# Consolidate every layer's Wiki/ into THIS repo's Wiki/, so the Institution page is the single place
+# to read the whole suite's documentation. Each layer's pages land under Wiki/<layer>/ with their own
+# internal links intact. The layer repos stay the canonical source (each ships its own wiki for a
+# standalone install); re-run this whenever a layer's wiki changes to re-sync the aggregated copy.
+#
+# Wiki/Home.md (the suite index) is hand-written and lives at the top level -- this script never
+# touches it, only the per-layer subfolders.
+#
+# Usage:  Tools/sync-wiki.sh      (assumes siblings at ../rimworld-<name>)
+set -euo pipefail
+
+HERE="$(cd "$(dirname "$0")/.." && pwd)"
+SIB="$(dirname "$HERE")"
+
+# layer folder -> sibling repo
+LAYERS=(
+  "core:rimworld-core"
+  "contraband:rimworld-contraband"
+  "justice:rimworld-justice"
+  "gangs:rimworld-gangs"
+  "ward:rimworld-ward"
+)
+
+echo "==> mirroring layer wikis into $HERE/Wiki/"
+for entry in "${LAYERS[@]}"; do
+  layer="${entry%%:*}"
+  repo="${entry##*:}"
+  src="$SIB/$repo/Wiki"
+  dst="$HERE/Wiki/$layer"
+  if [[ -d "$src" ]]; then
+    rm -rf "$dst"
+    mkdir -p "$dst"
+    cp "$src"/*.md "$dst"/
+    echo "    $layer: $(ls "$dst" | wc -l | tr -d ' ') pages"
+  else
+    echo "    $layer: no Wiki/ in $repo -- skipped"
+  fi
+done
+
+echo "==> done. The Institution wiki now mirrors every layer under Wiki/<layer>/; Wiki/Home.md is the index."