IX17: the pinned event's catalog entries name their branch

Pins.catalog is a list of {branch, revision} in the mesh-delivery seat's definition (revisions are numbered per watched branch),
the Go and TypeScript contracts regenerated, the fixtures follow.

Builds: design 47 G §579, A-169, A-171
Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h

modules/mesh-delivery-contracts/go/seats/meshdelivery/contract.go

@@ -434,12 +434,20 @@ const (
 	OwedActNote    = "note"
 )
 
+// PinsCatalogItem is one catalog graph revision, named by its watched branch and its number on the seat mesh-catalog (revisions are numbered per branch).
+type PinsCatalogItem struct {
+	// the watched branch the revision belongs to
+	Branch string `json:"branch"`
+	// its number on that branch
+	Revision int64 `json:"revision"`
+}
+
 // Pins is the graph revisions a delivery record starts or stops pointing at.
 type Pins struct {
 	// assignment graph revisions, by their number on the seat mesh-wants
 	Assignment []int64 `json:"assignment,omitempty"`
-	// catalog graph revisions, by their number on the seat mesh-catalog
-	Catalog []int64 `json:"catalog,omitempty"`
+	// catalog graph revisions, by watched branch and number on the seat mesh-catalog
+	Catalog []PinsCatalogItem `json:"catalog,omitempty"`
 	// the record's milestone
 	Milestone string `json:"milestone"`
 	// the record's id

modules/mesh-delivery-contracts/go/seats/meshdelivery/contract_test.go

@@ -21,9 +21,9 @@ func TestFixtures(t *testing.T) {
 			decode: func(b []byte) (any, error) { var v OwedEvent; err := json.Unmarshal(b, &v); return v, err }, subjectIs: regexp.MustCompile("^mesh\\.seat\\.mesh-delivery\\.event\\.owed\\.[^.*> ]+\\.[^.*> ]+$")},
 		{name: "owed is said, a status", subject: "mesh.seat.mesh-delivery.event.owed.novox/mesh-sdk.178", given: "{\"act\":\"status\",\"context\":\"mesh/merge-gate\",\"description\":\"waits for the operator's Approve\",\"head\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"id\":\"status.novox/mesh-sdk#178.aaaaaaaaaaaa.mesh/merge-gate\",\"number\":178,\"repository\":\"novox/mesh-sdk\",\"state\":\"pending\",\"target\":\"https://forge.test/x\"}", wire: "{\"act\":\"status\",\"context\":\"mesh/merge-gate\",\"description\":\"waits for the operator's Approve\",\"head\":\"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\",\"id\":\"status.novox/mesh-sdk#178.aaaaaaaaaaaa.mesh/merge-gate\",\"number\":178,\"repository\":\"novox/mesh-sdk\",\"state\":\"pending\",\"target\":\"https://forge.test/x\"}",
 			decode: func(b []byte) (any, error) { var v OwedEvent; err := json.Unmarshal(b, &v); return v, err }, subjectIs: regexp.MustCompile("^mesh\\.seat\\.mesh-delivery\\.event\\.owed\\.[^.*> ]+\\.[^.*> ]+$")},
-		{name: "pinned is said", subject: "mesh.seat.mesh-delivery.event.pinned", given: "{\"assignment\":[1204],\"catalog\":[3610],\"milestone\":\"47/G\",\"record\":\"47-G\"}", wire: "{\"assignment\":[1204],\"catalog\":[3610],\"milestone\":\"47/G\",\"record\":\"47-G\"}",
+		{name: "pinned is said", subject: "mesh.seat.mesh-delivery.event.pinned", given: "{\"assignment\":[1204],\"catalog\":[{\"branch\":\"main\",\"revision\":3610}],\"milestone\":\"47/G\",\"record\":\"47-G\"}", wire: "{\"assignment\":[1204],\"catalog\":[{\"branch\":\"main\",\"revision\":3610}],\"milestone\":\"47/G\",\"record\":\"47-G\"}",
 			decode: func(b []byte) (any, error) { var v PinnedEvent; err := json.Unmarshal(b, &v); return v, err }, subjectIs: regexp.MustCompile("^mesh\\.seat\\.mesh-delivery\\.event\\.pinned$")},
-		{name: "freed is said", subject: "mesh.seat.mesh-delivery.event.freed", given: "{\"assignment\":[1204],\"catalog\":[3610],\"milestone\":\"47/G\",\"record\":\"47-G\",\"why\":\"past its retention of 90 days\"}", wire: "{\"assignment\":[1204],\"catalog\":[3610],\"milestone\":\"47/G\",\"record\":\"47-G\",\"why\":\"past its retention of 90 days\"}",
+		{name: "freed is said", subject: "mesh.seat.mesh-delivery.event.freed", given: "{\"assignment\":[1204],\"catalog\":[{\"branch\":\"main\",\"revision\":3610}],\"milestone\":\"47/G\",\"record\":\"47-G\",\"why\":\"past its retention of 90 days\"}", wire: "{\"assignment\":[1204],\"catalog\":[{\"branch\":\"main\",\"revision\":3610}],\"milestone\":\"47/G\",\"record\":\"47-G\",\"why\":\"past its retention of 90 days\"}",
 			decode: func(b []byte) (any, error) { var v FreedEvent; err := json.Unmarshal(b, &v); return v, err }, subjectIs: regexp.MustCompile("^mesh\\.seat\\.mesh-delivery\\.event\\.freed$")},
 		{name: "heads-replaced is said", subject: "mesh.seat.mesh-delivery.event.heads-replaced", given: "{\"at\":\"2026-11-09T20:05:00Z\",\"group\":\"feat/47-G\",\"head\":\"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\",\"heads\":\"0123456789ab\",\"number\":178,\"repository\":\"novox/mesh-sdk\"}", wire: "{\"at\":\"2026-11-09T20:05:00Z\",\"group\":\"feat/47-G\",\"head\":\"bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\",\"heads\":\"0123456789ab\",\"number\":178,\"repository\":\"novox/mesh-sdk\"}",
 			decode: func(b []byte) (any, error) { var v HeadsReplacedEvent; err := json.Unmarshal(b, &v); return v, err }, subjectIs: regexp.MustCompile("^mesh\\.seat\\.mesh-delivery\\.event\\.heads-replaced$")},

modules/mesh-delivery-contracts/seats/mesh-delivery/fixtures/events.json

@@ -38,7 +38,10 @@
       "record": "47-G",
       "milestone": "47/G",
       "catalog": [
-        3610
+        {
+          "branch": "main",
+          "revision": 3610
+        }
       ],
       "assignment": [
         1204
@@ -53,7 +56,10 @@
       "record": "47-G",
       "milestone": "47/G",
       "catalog": [
-        3610
+        {
+          "branch": "main",
+          "revision": 3610
+        }
       ],
       "assignment": [
         1204

modules/mesh-delivery-contracts/seats/mesh-delivery/seat.json

@@ -1055,9 +1055,24 @@
         "catalog": {
           "type": "array",
           "items": {
-            "type": "integer"
+            "type": "object",
+            "description": "one catalog graph revision, named by its watched branch and its number on the seat mesh-catalog (revisions are numbered per branch)",
+            "properties": {
+              "branch": {
+                "type": "string",
+                "description": "the watched branch the revision belongs to"
+              },
+              "revision": {
+                "type": "integer",
+                "description": "its number on that branch"
+              }
+            },
+            "required": [
+              "branch",
+              "revision"
+            ]
           },
-          "description": "catalog graph revisions, by their number on the seat mesh-catalog"
+          "description": "catalog graph revisions, by watched branch and number on the seat mesh-catalog"
         },
         "assignment": {
           "type": "array",

modules/mesh-delivery-contracts/ts/seats/meshdelivery/index.d.ts

@@ -217,12 +217,20 @@ export interface Owed {
   "text"?: string;
 }
 
+/** one catalog graph revision, named by its watched branch and its number on the seat mesh-catalog (revisions are numbered per branch) */
+export interface PinsCatalogItem {
+  /** the watched branch the revision belongs to */
+  "branch": string;
+  /** its number on that branch */
+  "revision": number;
+}
+
 /** the graph revisions a delivery record starts or stops pointing at */
 export interface Pins {
   /** assignment graph revisions, by their number on the seat mesh-wants */
   "assignment"?: number[];
-  /** catalog graph revisions, by their number on the seat mesh-catalog */
-  "catalog"?: number[];
+  /** catalog graph revisions, by watched branch and number on the seat mesh-catalog */
+  "catalog"?: PinsCatalogItem[];
   /** the record's milestone */
   "milestone": string;
   /** the record's id */