mind-body: Brief.conversation is crate-visible like its type; start_self_run's inputs stay flat

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

crates/mind-body/src/persona.rs

@@ -1999,6 +1999,7 @@ fn reply_in_force(mind: &dyn MindPort, id: &str) -> Result<bool> {
 /// The brief becomes a follow-up of the Persona turn's run, and a Self run
 /// claims it. A Self run already live is her Self run: the follow-up waits in
 /// the queue for it. Answers that run and the follow-up it admitted.
+#[allow(clippy::too_many_arguments, reason = "one admission's inputs are these few things, and a struct for them would be a second owner")]
 fn start_self_run(
     organs: &Organs,
     control: &impl ControlSource,

crates/mind-body/src/self_run/inbox.rs

@@ -35,7 +35,7 @@ pub struct Brief {
     pub ordinal: u64,
     /// The conversation her Persona was in when it gave the brief, from the origin the follow-up records
     /// (none recorded, a brief admitted before origins existed, is the public one).
-    pub conversation: persona::Conversation,
+    pub(crate) conversation: persona::Conversation,
 }
 
 /// The ids of the follow-ups a closed run claims, with the run each was claimed by.