agent page: inbox view of last 30 messages addressed to this agent

new wire request AgentRequest::Recent { limit } / ManagerRequest::Recent
(plus matching responses with Vec<InboxRow>). InboxRow moved to
hive-sh4re so it lives on both surfaces without an internal-to-wire
conversion. host-side dispatch in agent_server / manager_server
calls broker.recent_for(name, limit).

per-agent web_ui /api/state grew an inbox: Vec<InboxRow> populated
via the same per-agent socket (best-effort; transport failure
returns empty). frontend renders as a collapsible <details> section
between the state row and the terminal — fmt timestamp / from /
body in a tight grid, capped at 16em scrollable. only visible when
there are rows.

hive-c0re/src/agent_server.rs

@@ -121,5 +121,11 @@ async fn dispatch(req: &AgentRequest, agent: &str, broker: &Broker) -> AgentResp
                 message: format!("{e:#}"),
             },
         },
+        AgentRequest::Recent { limit } => match broker.recent_for(agent, *limit) {
+            Ok(rows) => AgentResponse::Recent { rows },
+            Err(e) => AgentResponse::Err {
+                message: format!("{e:#}"),
+            },
+        },
     }
 }

hive-c0re/src/broker.rs

@@ -6,7 +6,7 @@ use std::sync::Mutex;
 use std::time::{SystemTime, UNIX_EPOCH};
 
 use anyhow::{Context, Result};
-use hive_sh4re::Message;
+use hive_sh4re::{InboxRow, Message};
 use rusqlite::{Connection, OptionalExtension, params};
 use serde::Serialize;
 use tokio::sync::broadcast;
@@ -28,16 +28,6 @@ CREATE INDEX IF NOT EXISTS idx_messages_undelivered
 /// may drop events past this; we send a `lagged` notice in their stream.
 const EVENT_CHANNEL: usize = 256;
 
-/// One row in a `recent_for()` query — the broker's flat view of a
-/// message addressed to a given recipient.
-#[derive(Debug, Clone, Serialize)]
-pub struct InboxRow {
-    pub id: i64,
-    pub from: String,
-    pub body: String,
-    pub at: i64,
-}
-
 #[derive(Debug, Clone, Serialize)]
 #[serde(rename_all = "snake_case", tag = "kind")]
 pub enum MessageEvent {

hive-c0re/src/dashboard.rs

@@ -102,7 +102,7 @@ struct StateSnapshot {
     /// Latest messages addressed to `operator` — surfaces agent replies
     /// asynchronously so the operator can see them without watching the
     /// live panel during a turn.
-    operator_inbox: Vec<crate::broker::InboxRow>,
+    operator_inbox: Vec<hive_sh4re::InboxRow>,
     /// Pending operator questions (currently only from the manager).
     /// `ask_operator` returns immediately with the id; on `/answer-question`
     /// we mark the row answered and fire `HelperEvent::OperatorAnswered`

hive-c0re/src/manager_server.rs

@@ -100,6 +100,12 @@ async fn dispatch(req: &ManagerRequest, coord: &Coordinator) -> ManagerResponse
                 message: format!("{e:#}"),
             },
         },
+        ManagerRequest::Recent { limit } => match coord.broker.recent_for(MANAGER_AGENT, *limit) {
+            Ok(rows) => ManagerResponse::Recent { rows },
+            Err(e) => ManagerResponse::Err {
+                message: format!("{e:#}"),
+            },
+        },
         ManagerRequest::Recv => match coord
             .broker
             .recv_blocking(MANAGER_AGENT, MANAGER_RECV_LONG_POLL)