K4, K5 (node-engine waits): the seat says wait-held and wait-ended, and the have carries its wait

defs.Wait has the fields of a wait (owner, step compose or kept-build, node, on, bound, since, clock-from, words, reason)
and, in the have, ask-at and act; wait-held.<node>.<module> and wait-ended.<node>.<module> are kept last per subject on
the stream running is kept on; the have's value gains wait, waits stays. Generated code waits for K21.

Builds: design 47 G §498, §499, §541, §556, §560, §629

Claude-Session: https://claude.ai/code/session_01JG73KEq4zoDfM9WtYpcQgZ

seats/node-engine/fixtures/events.json

@@ -131,5 +131,32 @@
       "stopped": true,
       "at": "2026-11-11T09:00:00Z"
     }
+  },
+  {
+    "name": "a kept build's wait is held",
+    "of": "event:wait-held",
+    "subject": "mesh.seat.node-engine.event.wait-held.ace.postgres",
+    "given": {
+      "owner": "node-engine",
+      "step": "kept-build",
+      "node": "ace",
+      "on": "the kept build of postgres",
+      "bound": "60m",
+      "since": "2026-11-11T10:00:00Z",
+      "clock-from": "2026-11-11T10:00:00Z",
+      "words": "waiting for the kept build of postgres on ace",
+      "reason": "node away"
+    }
+  },
+  {
+    "name": "a hold of the composition ends",
+    "of": "event:wait-ended",
+    "subject": "mesh.seat.node-engine.event.wait-ended.ace.postgres",
+    "given": {
+      "owner": "node-engine",
+      "step": "compose",
+      "since": "2026-11-11T10:00:00Z",
+      "reason": "restore point missing"
+    }
   }
 ]

seats/node-engine/fixtures/states.json

@@ -515,5 +515,28 @@
       "contract": 3,
       "at": "2026-11-05T12:00:00Z"
     }
+  },
+  {
+    "name": "a have that waits for the recovery module, with its wait, ask-at and act (design 47 G 560, 629)",
+    "of": "state:have/<node>.<module>",
+    "given": {
+      "v": 1,
+      "fp": "0123456789ab",
+      "phase": "held",
+      "detail": "waiting for a restore point",
+      "wait": {
+        "owner": "node-engine",
+        "step": "compose",
+        "on": "the recovery module's ended",
+        "bound": "90m",
+        "since": "2026-11-11T10:00:00Z",
+        "clock-from": "2026-11-11T10:00:00Z",
+        "words": "waiting for the point of postgres's data",
+        "reason": "recovery wait",
+        "ask-at": "2026-11-11T10:00:00Z",
+        "act": "a-20261111t100000"
+      },
+      "health": "waits"
+    }
   }
 ]

seats/node-engine/seat.json

@@ -904,6 +904,28 @@
       "body": {
         "$ref": "#/defs/Running"
       }
+    },
+    {
+      "name": "wait-held",
+      "subject": "wait-held.<node>.<module>",
+      "keep": {
+        "max-age-days": 0,
+        "last-per-subject": true
+      },
+      "body": {
+        "$ref": "#/defs/Wait"
+      }
+    },
+    {
+      "name": "wait-ended",
+      "subject": "wait-ended.<node>.<module>",
+      "keep": {
+        "max-age-days": 0,
+        "last-per-subject": true
+      },
+      "body": {
+        "$ref": "#/defs/Wait"
+      }
     }
   ],
   "family": {
@@ -1008,6 +1030,9 @@
               },
               "handed": {
                 "$ref": "#/defs/AccountsHanded"
+              },
+              "wait": {
+                "$ref": "#/defs/Wait"
               }
             },
             "required": [
@@ -2986,6 +3011,66 @@
         "node",
         "processes"
       ]
+    },
+    "Wait": {
+      "type": "object",
+      "description": "a hold or wait a node-engine says, the fields of the seat mesh-wants' wait (design 47 G 498, 512, 629); in the have it also carries ask-at and act (design 47 G 560)",
+      "properties": {
+        "owner": {
+          "type": "string",
+          "description": "the seat holding the wait: node-engine"
+        },
+        "step": {
+          "type": "string",
+          "enum": [
+            "compose",
+            "kept-build"
+          ],
+          "description": "compose: a hold of the composition (a restore point missing, an entry missing, parts that differ, a recovery that waits); kept-build: waiting for a kept build (design 47 G 499, 541)"
+        },
+        "node": {
+          "type": "string",
+          "description": "the node waited on: the build node for a kept build; the subject's <node> is the node that says it"
+        },
+        "on": {
+          "type": "string",
+          "description": "what it waits on"
+        },
+        "bound": {
+          "type": "string",
+          "description": "a duration such as 30m"
+        },
+        "since": {
+          "type": "string",
+          "format": "date-time"
+        },
+        "clock-from": {
+          "type": "string",
+          "format": "date-time",
+          "description": "the time the bound counts from (design 47 G 266, 269, 498)"
+        },
+        "words": {
+          "type": "string",
+          "description": "the wait said in words"
+        },
+        "reason": {
+          "type": "string",
+          "description": "why it holds, such as restore point missing, entry-missing, parts-differ, node away or build no longer kept (design 47 G 541, 499)"
+        },
+        "ask-at": {
+          "type": "string",
+          "format": "date-time",
+          "description": "in the have: the time of the first ask of the recovery module for this wait (design 47 G 560)"
+        },
+        "act": {
+          "type": "string",
+          "description": "in the have: the act the recovery module answered accepted with (design 47 G 560)"
+        }
+      },
+      "required": [
+        "step",
+        "since"
+      ]
     }
   }
 }