Grant a node's engine any verb and event of its node seat on its own node, so a verb added to the contract needs no grants release first (issue 774)

The grants part composed the engine's subscriptions from catalogue.EngineVerbs at its own mesh-sdk pin, so mesh-host #184's optional verb composition was refused on every node and every engine reopened its link every four minutes. Quick fix: re-pin the grants part. Thorough fix (this): the seat's subjects on the engine's node, any verb, as a module answers mesh.mod.<module>.tool.>; callers stay granted per verb.

go/buscompose/buscompose_test.go

@@ -320,6 +320,21 @@ func TestTheCopiedComposerComposesAsTheControllers(t *testing.T) {
 					!MaySubscribe(perms, "$SRV.INFO."+EngineSeat) || MaySubscribe(perms, "mesh.seat."+EngineSeat+".tool.hand-over.two") {
 					t.Errorf("node one hears %v", perms.Subscribe)
 				}
+				// A verb or an event the seat's contract gains later is its engine's on its own node without a release of
+				// the grants part (2026-10-31: mesh-host #184's optional verb composition was refused on every node, the
+				// grants part's mesh-sdk pin predating it): the seat's subjects on its node, any verb, any event.
+				for _, verb := range []string{"composition", "compose", "a-verb-added-later"} {
+					if !MaySubscribe(perms, "mesh.seat."+EngineSeat+".tool."+verb+".one") ||
+						!MaySubscribe(perms, "mesh.seat."+EngineSeat+".call."+verb+".one.messenger~one") ||
+						MaySubscribe(perms, "mesh.seat."+EngineSeat+".tool."+verb+".two") ||
+						MaySubscribe(perms, "mesh.seat."+EngineSeat+".call."+verb+".two.messenger~one") {
+						t.Errorf("node one does not answer %s on its own node alone: %v", verb, perms.Subscribe)
+					}
+				}
+				if !MayPublish(perms, "mesh.seat."+EngineSeat+".event.an-event-added-later.one") ||
+					MayPublish(perms, "mesh.seat."+EngineSeat+".event.an-event-added-later.two") {
+					t.Errorf("node one does not say a later event on its own node alone: %v", perms.Publish)
+				}
 			case u.Kind == KindNodeTools || u.Module == "messenger":
 				if !MayPublish(perms, "mesh.seat."+EngineSeat+".tool.root-free.one") {
 					t.Errorf("%s cannot call one's root-free", u.Username())

go/buscompose/engine.go

@@ -39,13 +39,15 @@ func EnginePackagesGrants(node string) []string {
 // seat's events about its node, answers discovery for the seat, asks who answers what (the login shell's execute, ADR
 // 0563 §6), and asks the operator under asks.EngineAsker(node) on the router's seat as its holder declares it, as any
 // user of that seat is granted.
+//
+// Its verbs and events are granted as any verb and any event of the seat on its own node, not as the contract's list:
+// the list is compiled into whichever mesh-sdk the grants part pins, so a verb the engine gained before the grants part
+// was released was refused on every node and the engine reopened its link every few minutes (2026-10-31, the optional
+// verb composition of mesh-host #184). As a module answers `mesh.mod.<module>.tool.>`, nothing is given away: no other
+// principal may subscribe this seat's subjects of this node, and a caller is still granted each verb by name.
 func engineGrants(p Principal) (pub, sub []string) {
-	for _, v := range catalogue.EngineVerbs() {
+	sub = append(sub, "mesh.seat."+EngineSeat+".tool.*."+p.Node)
-		sub = append(sub, "mesh.seat."+EngineSeat+".tool."+v.Name+"."+p.Node)
+	pub = append(pub, "mesh.seat."+EngineSeat+".event.*."+p.Node)
-	}
-	for _, e := range catalogue.EngineEvents {
-		pub = append(pub, "mesh.seat."+EngineSeat+".event."+e+"."+p.Node)
-	}
 	sub = append(sub, announcing(EngineSeat)...)
 	pub = append(pub, discovering()...)
 	tp, ts := seatTrafficGrants(SeatTrafficOf(asks.EngineAsker(p.Node), nil, p.Uses, nil))