remove operator as target for scheduled prompts

hive-agent-mcp/src/mcp/args.rs

@@ -196,9 +196,10 @@ pub struct UpdateMetaInputsArgs {
 #[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
 pub struct RequestSchedulePromptArgs {
     /// Recipient agents — one schedule fires to many inboxes at the
-    /// scheduled time. `operator` is a legitimate target (mara: "we
-    /// want to get rid of the manager special case so yes manager
-    /// can be recipient" — the operator slot follows the same rule).
+    /// scheduled time. `operator` is not a valid target — she isn't a
+    /// container with a todo inbox to push a wake into, and this is
+    /// for fanning a prompt out to agents, not scheduling something
+    /// at her.
     pub targets: Vec<String>,
     /// Message body delivered to each target's inbox at fire time.
     /// Same size budget as `send` bodies.