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-sh4re/src/lib.rs

@@ -146,6 +146,19 @@ pub struct Message {
     pub body: String,
 }
 
+/// One row of a broker inbox query — what the dashboard renders in
+/// its operator-inbox section and what a per-agent web UI returns
+/// from a `Recent` request. Lives in `hive_sh4re` so it can travel
+/// over both the dashboard's `/api/state` and the agent socket
+/// without an internal-to-wire conversion.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct InboxRow {
+    pub id: i64,
+    pub from: String,
+    pub body: String,
+    pub at: i64,
+}
+
 /// Requests on a per-agent socket. The agent's identity is the socket
 /// it came in on; `Send.from` is filled in by the server, not the client.
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -163,6 +176,10 @@ pub enum AgentRequest {
     /// per-agent equivalent of the old dashboard T4LK form, but scoped to
     /// the agent whose page the operator is on.
     OperatorMsg { body: String },
+    /// Last `limit` messages addressed to this agent, newest-first.
+    /// Non-mutating — pulls from the broker without delivering. The
+    /// per-agent web UI uses this to render its own inbox section.
+    Recent { limit: u64 },
 }
 
 /// Responses on a per-agent socket.
@@ -179,6 +196,8 @@ pub enum AgentResponse {
     Empty,
     /// `Status` result: how many pending messages are in this agent's inbox.
     Status { unread: u64 },
+    /// `Recent` result: newest-first inbox rows.
+    Recent { rows: Vec<InboxRow> },
 }
 
 // -----------------------------------------------------------------------------
@@ -264,6 +283,11 @@ pub enum ManagerRequest {
     OperatorMsg {
         body: String,
     },
+    /// Last `limit` messages addressed to the manager, newest-first.
+    /// Non-mutating; mirror of `AgentRequest::Recent`.
+    Recent {
+        limit: u64,
+    },
     /// Submit a spawn request for the user to approve. On approval the host
     /// creates and starts the container. Brand-new agent names only — if an
     /// agent of the same name already exists, the approval will fail.
@@ -329,4 +353,8 @@ pub enum ManagerResponse {
     QuestionQueued {
         id: i64,
     },
+    /// `Recent` result: mirror of `AgentResponse::Recent`.
+    Recent {
+        rows: Vec<InboxRow>,
+    },
 }