mavend: carry ResolvedBy through dialogue Slots bridge

Add ResolvedBy to dialogue.Slots and the toDialogueSlots/
applyDialogueSlots converters. Skip reflect-type check for this field
in parity test (dialogue cannot import router: import cycle).

cmd/mavend/slotsparity_test.go

@@ -31,6 +31,12 @@ func TestSlotsParity(t *testing.T) {
 			t.Errorf("router.Slots.%s (%s) missing from dialogue.Slots", name, typ)
 			continue
 		}
+		// ResolvedBy is ActionResolutionMethod in router and string in dialogue
+		// (dialogue cannot import router: import cycle). The underlying type is
+		// string in both; skip the reflect-type check for this field.
+		if name == "ResolvedBy" {
+			continue
+		}
 		if dt != typ {
 			t.Errorf("field %s: router has %s, dialogue has %s", name, typ, dt)
 		}
@@ -47,15 +53,16 @@ func TestSlotsParity(t *testing.T) {
 // populated value and compare.
 func TestSlotsRoundTrip(t *testing.T) {
 	full := router.Slots{
-		Time:    time.Date(2026, 8, 2, 11, 0, 0, 0, time.UTC),
-		HasTime: true,
-		Fn:      "restart",
-		Args:    []string{"nginx"},
-		HasFn:   true,
-		Key:     "water",
-		Value:   `"drank"`,
-		HasKey:  true,
-		Text:    "выпил воды",
+		Time:       time.Date(2026, 8, 2, 11, 0, 0, 0, time.UTC),
+		HasTime:    true,
+		Fn:         "restart",
+		Args:       []string{"nginx"},
+		HasFn:      true,
+		ResolvedBy: router.ActionResolutionGrammarMatcher,
+		Key:        "water",
+		Value:      `"drank"`,
+		HasKey:     true,
+		Text:       "выпил воды",
 	}
 	// Every field must be non-zero, or the round-trip proves nothing.
 	rv := reflect.ValueOf(full)