add optional in_reply_to field on send for conversation threading

hive-ag3nt/src/bin/hive-ag3nt.rs

@@ -378,6 +378,7 @@ async fn notify_manager_of_failure(socket: &Path, label: &str, err: &anyhow::Err
         &AgentRequest::Send {
             to: "manager".into(),
             body,
+            in_reply_to: None,
         },
     )
     .await;

hive-ag3nt/src/mcp.rs

@@ -314,6 +314,12 @@ pub struct SendArgs {
     pub to: String,
     /// Message body. Plain text; the broker doesn't parse it.
     pub body: String,
+    /// Optional broker row-id of the message this is a reply to. Lets
+    /// the dashboard render conversation threads. Pass the `id` from the
+    /// `DeliveredMessage` you're responding to; omit for new threads.
+    /// Silently ignored if the id is unknown or out of retention.
+    #[serde(default)]
+    pub in_reply_to: Option<i64>,
 }
 
 #[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
@@ -410,6 +416,7 @@ impl AgentServer {
                 .dispatch(hive_sh4re::AgentRequest::Send {
                     to: args.to,
                     body: args.body,
+                    in_reply_to: args.in_reply_to,
                 })
                 .await;
             annotate_retries(format_ack(resp, "send", format!("sent to {to}")), retries)
@@ -802,6 +809,7 @@ impl ManagerServer {
                 .dispatch(hive_sh4re::ManagerRequest::Send {
                     to: args.to,
                     body: args.body,
+                    in_reply_to: args.in_reply_to,
                 })
                 .await;
             annotate_retries(format_ack(resp, "send", format!("sent to {to}")), retries)

hive-ag3nt/src/plugins.rs

@@ -176,6 +176,7 @@ async fn notify(socket: &Path, to: &str, body: String) {
     let req = hive_sh4re::AgentRequest::Send {
         to: to.to_owned(),
         body,
+        in_reply_to: None,
     };
     if let Err(e) = client::request::<_, hive_sh4re::AgentResponse>(socket, &req).await {
         tracing::warn!(error = ?e, "failed to notify {to} of plugin install failure");