Add the node-engine verb compose to the seat's contract: compose now, the recovery of a failed composition (issue 774)

go/catalogue/engine_seat.go

@@ -61,6 +61,14 @@ func EngineVerbs() []Verb {
 			Input: schema(map[string]string{"module": "the module, as placed on this machine; node for the node's own",
 				"digest": "a composition's digest (sha256:…), to read that revision rather than the latest",
 				"diff":   "\"true\": list the resources that differ from what runs"}, []string{"module"})},
+		// The recovery of a composition that failed (issue 774, 2026-10-31: ace kept route-proxy failed for a vault that
+		// answered again a minute later). Optional until every engine serves it.
+		{Name: "compose", Optional: true, Description: "Compose this machine's modules now and say how it went, so a " +
+			"composition that failed, or a module held, recovers without a restart: what the pass refused or held, each " +
+			"with why, and when the engine composes again on its own after a seat that did not answer (a deadline, no " +
+			"responders: retried with a growing wait; a refusal never). With module, that module's apply is also tried " +
+			"again. Changes only what a pass the engine makes on its own would change.",
+			Input: schema(map[string]string{"module": "a module placed on this machine whose apply is also tried again (optional)"}, nil)},
 	}
 }