diff --git a/sync/deploy-clade-a2ml.sh b/sync/deploy-clade-a2ml.sh
index 8da43b5..9433a8f 100755
--- a/sync/deploy-clade-a2ml.sh
+++ b/sync/deploy-clade-a2ml.sh
@@ -44,6 +44,9 @@ deploy_clade() {
     local lineage="$4"
     local parent="$5"
     local description="$6"
+    # Forge owner/org hosting this repo. Optional in repos.a2ml; parse-repos.sh
+    # defaults it to "hyperpolymath", so existing entries are unaffected.
+    local owner="${7:-hyperpolymath}"
 
     local repo_path="$REPOS_DIR/$repo_name"
 
@@ -68,17 +71,52 @@ deploy_clade() {
         return
     fi
 
-    # Skip if CLADE.a2ml already exists
-    if [[ -f "$repo_path/.machine_readable/CLADE.a2ml" ]]; then
-        echo "ALREADY: $repo_name"
-        ((ALREADY++))
+    # Skip if CLADE.a2ml already exists.
+    #
+    # Check BOTH known layouts. Two are in use across the estate and the canon
+    # does not yet agree which is authoritative:
+    #   .machine_readable/CLADE.a2ml               — this script + the CLADE-001 contractile
+    #   .machine_readable/descriptiles/CLADE.a2ml  — rsr-template-repo + chronicles-of-slavia
+    # Checking only the first meant a repo using the descriptiles layout looked
+    # like it had no CLADE at all, so this script would write a SECOND one — two
+    # files, two identities, no error. That disagreement is unresolved and is the
+    # owner's to settle; until then, refusing to write over an existing
+    # declaration is the safe reading.
+    local existing
+    for existing in "$repo_path/.machine_readable/CLADE.a2ml" \
+                    "$repo_path/.machine_readable/descriptiles/CLADE.a2ml"; do
+        if [[ -f "$existing" ]]; then
+            echo "ALREADY: $repo_name (${existing#$repo_path/})"
+            ((ALREADY++))
+            return
+        fi
+    done
+
+    # Generate deterministic UUID v5.
+    #
+    # The owner segment is part of the derived name, so it is part of the
+    # IDENTITY — get it wrong and the repo gets a uuid that belongs to nothing.
+    # It was hardcoded to "hyperpolymath", which silently produced a wrong uuid
+    # for any repo hosted elsewhere (e.g. the metadatastician org). Now sourced
+    # from the registry entry, still defaulting to "hyperpolymath" so every
+    # existing entry derives byte-identically.
+    local uuid
+    uuid=$(uuidgen --sha1 --namespace @url --name "github.com/$owner/$repo_name")
+
+    # Fail loudly if the registry disagrees with the repo's actual remote — a
+    # silently wrong owner means a silently wrong identity, which is worse than
+    # no identity at all.
+    local remote_owner
+    remote_owner=$(git -C "$repo_path" remote get-url origin 2>/dev/null \
+        | sed -nE 's#^(https?://[^/]+/|[^@]+@[^:]+:)([^/]+)/.*$#\2#p')
+    if [[ -n "$remote_owner" && "$remote_owner" != "$owner" ]]; then
+        echo "WARN: $repo_name — registry says owner='$owner' but origin says '$remote_owner'." >&2
+        echo "      The uuid is derived FROM the owner, so one of them is wrong." >&2
+        echo "      Set 'owner = \"$remote_owner\"' in repos.a2ml, or fix the remote. Skipping." >&2
+        ((FAILED++))
         return
     fi
 
-    # Generate deterministic UUID v5
-    local uuid
-    uuid=$(uuidgen --sha1 --namespace @url --name "github.com/hyperpolymath/$repo_name")
-
     # Determine prefixed name
     local prefixed="${primary}-${repo_name}"
 
@@ -94,7 +132,7 @@ deploy_clade() {
 [identity]
 uuid = "$uuid"
 primary-forge = "github"
-primary-owner = "hyperpolymath"
+primary-owner = "$owner"
 canonical-name = "$repo_name"
 prefixed-name = "$prefixed"
 
@@ -105,9 +143,9 @@ assigned = "2026-03-16"
 rationale = "$description"
 
 [forges]
-github = "hyperpolymath/$repo_name"
-gitlab = "hyperpolymath/$repo_name"
-bitbucket = "hyperpolymath/$repo_name"
+github = "$owner/$repo_name"
+gitlab = "$owner/$repo_name"
+bitbucket = "$owner/$repo_name"
 
 [lineage]
 type = "$lineage"
@@ -148,8 +186,8 @@ echo "Repos dir: $REPOS_DIR"
 [[ "$DRY_RUN" == "--dry-run" ]] && echo "MODE: DRY RUN"
 echo ""
 
-while IFS=$'\t' read -r name primary secondary lineage parent description; do
-    deploy_clade "$name" "$primary" "$secondary" "$lineage" "$parent" "$description"
+while IFS=$'\t' read -r name primary secondary lineage parent description owner; do
+    deploy_clade "$name" "$primary" "$secondary" "$lineage" "$parent" "$description" "$owner"
 done < <(parse_repos)
 
 echo ""
diff --git a/sync/export-json.sh b/sync/export-json.sh
index c8f5e4c..7399a36 100755
--- a/sync/export-json.sh
+++ b/sync/export-json.sh
@@ -23,12 +23,19 @@ BEGIN { printf "[\n" }
 NR > 1 { printf ",\n" }
 {
     name = $1; primary = $2; secondary = $3; lineage = $4; parent = $5; desc = $6
+    owner = ($7 != "" ? $7 : "hyperpolymath")
     gsub(/"/, "\\\"", desc)
-    # Generate UUID deterministically
-    cmd = "uuidgen --sha1 --namespace @url --name \"github.com/hyperpolymath/" name "\""
+    # Generate UUID deterministically. The owner segment is part of the derived
+    # name, so it is part of the identity; it was hardcoded to "hyperpolymath",
+    # which produced a wrong uuid for any repo hosted elsewhere. Defaults to
+    # "hyperpolymath", so entries without an explicit owner are unchanged.
+    cmd = "uuidgen --sha1 --namespace @url --name \"github.com/" owner "/" name "\""
     cmd | getline uuid
     close(cmd)
-    printf "  {\"name\":\"%s\",\"uuid\":\"%s\",\"clade\":\"%s\",\"secondary\":%s,\"lineage\":\"%s\",\"parent\":\"%s\",\"description\":\"%s\",\"prefixed\":\"%s-%s\",\"github\":\"hyperpolymath/%s\"}", name, uuid, primary, secondary, lineage, parent, desc, primary, name, name
+    # NB: no separate "owner" key — the schema is unchanged on purpose. The
+    # github field already carries it as "owner/name", so entries without an
+    # explicit owner serialise byte-identically to before this change.
+    printf "  {\"name\":\"%s\",\"uuid\":\"%s\",\"clade\":\"%s\",\"secondary\":%s,\"lineage\":\"%s\",\"parent\":\"%s\",\"description\":\"%s\",\"prefixed\":\"%s-%s\",\"github\":\"%s/%s\"}", name, uuid, primary, secondary, lineage, parent, desc, primary, name, owner, name
 }
 END { printf "\n]\n" }
 ' > "$OUT/repos.json"
diff --git a/sync/parse-repos.sh b/sync/parse-repos.sh
index d2588e5..dfdf13f 100755
--- a/sync/parse-repos.sh
+++ b/sync/parse-repos.sh
@@ -1,6 +1,19 @@
 #!/usr/bin/env bash
 # SPDX-License-Identifier: MPL-2.0
-# Parse repos.a2ml and emit TSV: name\tprimary\tsecondary\tlineage\tparent\tdescription
+# Parse repos.a2ml and emit TSV:
+#   name\tprimary\tsecondary\tlineage\tparent\tdescription\towner
+#
+# `owner` is the forge owner/org that hosts the repo. It is OPTIONAL in
+# repos.a2ml and defaults to "hyperpolymath", so every existing entry parses
+# exactly as before and derives exactly the same uuid. Set it per-entry only for
+# repos hosted elsewhere:
+#
+#   [repo.cadastra]
+#   primary = "rm"
+#   owner   = "metadatastician"
+#
+# It is the LAST column: consumers that read only the first six fields are
+# unaffected by its presence.
 
 # Default to this repo's seed file (script lives in sync/, seed in verisim/seed/).
 SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
@@ -10,14 +23,14 @@ awk '
 BEGIN { FS="=" }
 /^\[repo\./ {
     if (current_repo != "") {
-        printf "%s\t%s\t%s\t%s\t%s\t%s\n", current_repo, primary, secondary, lineage, parent, description
+        printf "%s\t%s\t%s\t%s\t%s\t%s\t%s\n", current_repo, primary, secondary, lineage, parent, description, owner
     }
     line = $0
     gsub(/^\[repo\./, "", line)
     gsub(/\]$/, "", line)
     gsub(/"/, "", line)
     current_repo = line
-    primary = ""; secondary = "[]"; description = ""; lineage = "standalone"; parent = ""
+    primary = ""; secondary = "[]"; description = ""; lineage = "standalone"; parent = ""; owner = "hyperpolymath"
 }
 current_repo != "" && /^primary / {
     val = $2
@@ -44,9 +57,14 @@ current_repo != "" && /^parent / {
     gsub(/^ *"/, "", val); gsub(/".*$/, "", val)
     parent = val
 }
+current_repo != "" && /^owner / {
+    val = $2
+    gsub(/^ *"/, "", val); gsub(/".*$/, "", val)
+    owner = val
+}
 END {
     if (current_repo != "") {
-        printf "%s\t%s\t%s\t%s\t%s\t%s\n", current_repo, primary, secondary, lineage, parent, description
+        printf "%s\t%s\t%s\t%s\t%s\t%s\t%s\n", current_repo, primary, secondary, lineage, parent, description, owner
     }
 }
 ' "$SEED_FILE"