give: take only a value a person holds, ask the desk by name, let the controller alone ask it, and announce every value given

The review of 2026-10-09 (M4):
- give refuses broker (the bus account issue mints) and any own secret the mesh may make itself;
- the desk's prompt is asked by module, secret and machine, never with words of the caller's, and the
  bus denies the prompt's subjects to every principal but the controller, however wide its grant, so the
  prompt's 'the controller asks' is the bus's word (Permissions.PublishDeny, broker.ControllerOnly);
- secret accept with a value is refused through a verb: a value comes from the terminal or the desk;
- every value given for an own secret, at the terminal or the desk, raises the urgent condition
  secret-given on every channel, until the operator silences it.

internal/catalogue/graphical_session.go

@@ -84,12 +84,16 @@ func graphicalSessionSeats() []Seat {
 			{Name: "secret", Optional: true, Description: "Ask the operator for a value in a prompt that " +
 				"does not show what is typed, and answer it sealed to the key the asker gives — never in " +
 				"the clear — or cancelled when the prompt was dismissed or not answered in time.",
+				// By name, never by words (the review of 2026-10-09, M4): the holder writes the prompt from the
+				// module, the secret and the machine, and says the controller asks — the bus lets nobody else
+				// ask it (broker.ControllerOnly) — so no caller puts words of its own before the operator.
 				Input: schema(map[string]string{
-					"prompt":          "what the prompt asks",
-					"message":         "a line saying who asks and for what (optional)",
+					"module":          "the module whose own secret is asked for",
+					"secret":          "the own secret's name",
+					"node":            "the machine the module runs on",
 					"seal_to":         "the asker's public sealing key: the answer is sealed to it",
 					"timeout_seconds": "give up after this long (optional)",
-				}, []string{"prompt", "seal_to"})},
+				}, []string{"module", "secret", "node", "seal_to"})},
 		}},
 		{Name: NotifierSeat, Scope: ScopeNode, Decision: decided, Serves: []Verb{
 			{Name: "send", Description: "Show the operator a notification.",