diff --git a/openspec/changes/email-calendar-sync/hydra.json b/openspec/changes/email-calendar-sync/hydra.json
new file mode 100644
index 00000000..4eff1caa
--- /dev/null
+++ b/openspec/changes/email-calendar-sync/hydra.json
@@ -0,0 +1,13 @@
+{
+  "schema_version": 2,
+  "spec_slug": "email-calendar-sync",
+  "app": "pipelinq",
+  "repo": "https://github.com/ConductionNL/pipelinq",
+  "depends_on": [
+    "integration-calendar",
+    "integration-email"
+  ],
+  "issue": "",
+  "pipeline": {},
+  "cycles": []
+}
diff --git a/openspec/changes/integration-calendar/README.md b/openspec/changes/integration-calendar/README.md
new file mode 100644
index 00000000..bd0c64ff
--- /dev/null
+++ b/openspec/changes/integration-calendar/README.md
@@ -0,0 +1,7 @@
+# integration-calendar (cross-repo stub)
+
+Authoritative spec: [ConductionNL/openregister → openspec/changes/integration-calendar](https://github.com/ConductionNL/openregister/tree/development/openspec/changes/integration-calendar).
+
+Tracking issue: https://github.com/ConductionNL/openregister/issues/1308
+
+Stub exists so Hydra's sibling-based dependency check can resolve cross-repo `depends_on`.
diff --git a/openspec/changes/integration-calendar/hydra.json b/openspec/changes/integration-calendar/hydra.json
new file mode 100644
index 00000000..035484eb
--- /dev/null
+++ b/openspec/changes/integration-calendar/hydra.json
@@ -0,0 +1,12 @@
+{
+  "schema_version": 2,
+  "spec_slug": "integration-calendar",
+  "app": "openregister",
+  "repo": "https://github.com/ConductionNL/openregister",
+  "issue": "https://github.com/ConductionNL/openregister/issues/1308",
+  "depends_on": [],
+  "cross_repo_stub": true,
+  "note": "Cross-repo dependency stub. Authoritative spec lives in ConductionNL/openregister. Do NOT edit here.",
+  "pipeline": {},
+  "cycles": []
+}
diff --git a/openspec/changes/integration-contacts/README.md b/openspec/changes/integration-contacts/README.md
new file mode 100644
index 00000000..a1bf35f5
--- /dev/null
+++ b/openspec/changes/integration-contacts/README.md
@@ -0,0 +1,7 @@
+# integration-contacts (cross-repo stub)
+
+Authoritative spec: [ConductionNL/openregister → openspec/changes/integration-contacts](https://github.com/ConductionNL/openregister/tree/development/openspec/changes/integration-contacts).
+
+Tracking issue: https://github.com/ConductionNL/openregister/issues/1311
+
+Stub exists so Hydra's sibling-based dependency check can resolve cross-repo `depends_on`.
diff --git a/openspec/changes/integration-contacts/hydra.json b/openspec/changes/integration-contacts/hydra.json
new file mode 100644
index 00000000..fe10ab19
--- /dev/null
+++ b/openspec/changes/integration-contacts/hydra.json
@@ -0,0 +1,12 @@
+{
+  "schema_version": 2,
+  "spec_slug": "integration-contacts",
+  "app": "openregister",
+  "repo": "https://github.com/ConductionNL/openregister",
+  "issue": "https://github.com/ConductionNL/openregister/issues/1311",
+  "depends_on": [],
+  "cross_repo_stub": true,
+  "note": "Cross-repo dependency stub. Authoritative spec lives in ConductionNL/openregister. Do NOT edit here.",
+  "pipeline": {},
+  "cycles": []
+}
diff --git a/openspec/changes/integration-email/README.md b/openspec/changes/integration-email/README.md
new file mode 100644
index 00000000..91667a6f
--- /dev/null
+++ b/openspec/changes/integration-email/README.md
@@ -0,0 +1,7 @@
+# integration-email (cross-repo stub)
+
+Authoritative spec: [ConductionNL/openregister → openspec/changes/integration-email](https://github.com/ConductionNL/openregister/tree/development/openspec/changes/integration-email).
+
+Tracking issue: https://github.com/ConductionNL/openregister/issues/1309
+
+Stub exists so Hydra's sibling-based dependency check can resolve cross-repo `depends_on`.
diff --git a/openspec/changes/integration-email/hydra.json b/openspec/changes/integration-email/hydra.json
new file mode 100644
index 00000000..e0683b86
--- /dev/null
+++ b/openspec/changes/integration-email/hydra.json
@@ -0,0 +1,12 @@
+{
+  "schema_version": 2,
+  "spec_slug": "integration-email",
+  "app": "openregister",
+  "repo": "https://github.com/ConductionNL/openregister",
+  "issue": "https://github.com/ConductionNL/openregister/issues/1309",
+  "depends_on": [],
+  "cross_repo_stub": true,
+  "note": "Cross-repo dependency stub. Authoritative spec lives in ConductionNL/openregister. Do NOT edit here.",
+  "pipeline": {},
+  "cycles": []
+}
diff --git a/openspec/changes/integration-forms/README.md b/openspec/changes/integration-forms/README.md
new file mode 100644
index 00000000..9354cb54
--- /dev/null
+++ b/openspec/changes/integration-forms/README.md
@@ -0,0 +1,7 @@
+# integration-forms (cross-repo stub)
+
+Authoritative spec: [ConductionNL/openregister → openspec/changes/integration-forms](https://github.com/ConductionNL/openregister/tree/development/openspec/changes/integration-forms).
+
+Tracking issue: https://github.com/ConductionNL/openregister/issues/1313
+
+Stub exists so Hydra's sibling-based dependency check can resolve cross-repo `depends_on`.
diff --git a/openspec/changes/integration-forms/hydra.json b/openspec/changes/integration-forms/hydra.json
new file mode 100644
index 00000000..56cea355
--- /dev/null
+++ b/openspec/changes/integration-forms/hydra.json
@@ -0,0 +1,12 @@
+{
+  "schema_version": 2,
+  "spec_slug": "integration-forms",
+  "app": "openregister",
+  "repo": "https://github.com/ConductionNL/openregister",
+  "issue": "https://github.com/ConductionNL/openregister/issues/1313",
+  "depends_on": [],
+  "cross_repo_stub": true,
+  "note": "Cross-repo dependency stub. Authoritative spec lives in ConductionNL/openregister. Do NOT edit here.",
+  "pipeline": {},
+  "cycles": []
+}
diff --git a/openspec/changes/pluggable-integration-registry/README.md b/openspec/changes/pluggable-integration-registry/README.md
new file mode 100644
index 00000000..f0a57a37
--- /dev/null
+++ b/openspec/changes/pluggable-integration-registry/README.md
@@ -0,0 +1,7 @@
+# pluggable-integration-registry (cross-repo stub)
+
+Authoritative spec: [ConductionNL/openregister → openspec/changes/pluggable-integration-registry](https://github.com/ConductionNL/openregister/tree/development/openspec/changes/pluggable-integration-registry).
+
+Tracking issue: https://github.com/ConductionNL/openregister/issues/1307
+
+Stub exists so Hydra's sibling-based dependency check can resolve cross-repo `depends_on`.
diff --git a/openspec/changes/pluggable-integration-registry/hydra.json b/openspec/changes/pluggable-integration-registry/hydra.json
new file mode 100644
index 00000000..00986326
--- /dev/null
+++ b/openspec/changes/pluggable-integration-registry/hydra.json
@@ -0,0 +1,12 @@
+{
+  "schema_version": 2,
+  "spec_slug": "pluggable-integration-registry",
+  "app": "openregister",
+  "repo": "https://github.com/ConductionNL/openregister",
+  "issue": "https://github.com/ConductionNL/openregister/issues/1307",
+  "depends_on": [],
+  "cross_repo_stub": true,
+  "note": "Cross-repo dependency stub. Authoritative spec lives in ConductionNL/openregister. Do NOT edit here.",
+  "pipeline": {},
+  "cycles": []
+}
diff --git a/openspec/changes/public-intake-forms/hydra.json b/openspec/changes/public-intake-forms/hydra.json
new file mode 100644
index 00000000..2c762870
--- /dev/null
+++ b/openspec/changes/public-intake-forms/hydra.json
@@ -0,0 +1,12 @@
+{
+  "schema_version": 2,
+  "spec_slug": "public-intake-forms",
+  "app": "pipelinq",
+  "repo": "https://github.com/ConductionNL/pipelinq",
+  "depends_on": [
+    "integration-forms"
+  ],
+  "issue": "",
+  "pipeline": {},
+  "cycles": []
+}