agent ui: terminal-themed live panel; pretty tool calls; collapsed results

- tool_use renders per-tool (Read /path, Bash $ cmd, send → operator: ...)
- tool_result with >120 chars collapses into <details>; short ones inline
- session_init / result / rate_limit dropped from the panel
- thinking content shown inline if present, fallback indicator otherwise
- TurnStart carries unread count → header badge "· 3 unread"
- per-tool [status] line dropped from envelope; lives in wake prompt + UI
- send form moved below the live panel
- live panel themed as a terminal (crust bg, inset shadow, monospace)

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

@@ -135,11 +135,13 @@ async fn serve(
         match recv {
             Ok(AgentResponse::Message { from, body }) => {
                 tracing::info!(%from, %body, "inbox");
+                let unread = inbox_unread(socket).await;
                 bus.emit(LiveEvent::TurnStart {
                     from: from.clone(),
                     body: body.clone(),
+                    unread,
                 });
-                let prompt = format_wake_prompt(&from, &body);
+                let prompt = format_wake_prompt(&from, &body, unread);
                 let outcome = turn::drive_turn(
                     &prompt,
                     &mcp_config,
@@ -168,9 +170,24 @@ async fn serve(
 
 /// Per-turn user prompt. The role/tools/etc. is in the system prompt
 /// (`prompts/agent.md` → `claude --system-prompt-file`); this is just the
-/// wake signal claude reacts to.
-fn format_wake_prompt(from: &str, body: &str) -> String {
-    format!("Incoming message from `{from}`:\n---\n{body}\n---")
+/// wake signal claude reacts to. `unread` is the count of *other*
+/// messages in the inbox right after this one was popped.
+fn format_wake_prompt(from: &str, body: &str, unread: u64) -> String {
+    let pending = if unread == 0 {
+        String::new()
+    } else {
+        format!("\n\n({unread} more message(s) pending in your inbox — drain via `mcp__hyperhive__recv` if relevant.)")
+    };
+    format!("Incoming message from `{from}`:\n---\n{body}\n---{pending}")
+}
+
+/// Best-effort: ask our own per-agent socket how many messages are still
+/// pending after the wake-up Recv. Returns 0 if anything goes wrong.
+async fn inbox_unread(socket: &Path) -> u64 {
+    match client::request::<_, AgentResponse>(socket, &AgentRequest::Status).await {
+        Ok(AgentResponse::Status { unread }) => unread,
+        _ => 0,
+    }
 }
 
 fn render(resp: &AgentResponse) -> Result<()> {