add list_accounts daemon op to hive-matrix-mcp

hive-matrix-mcp/src/protocol.rs

@@ -171,6 +171,16 @@ pub enum DaemonOp {
     #[serde(rename = "unread_summary")]
     UnreadSummary,
 
+    /// List the matrix accounts the daemon currently has a live,
+    /// restored session for. Account-agnostic (does not resolve a single
+    /// client — handled before client resolution in `socket::dispatch`):
+    /// returns each restored account's name, homeserver, user id, primary
+    /// flag, and a `live` flag. Backs the dashboard's per-account status
+    /// (BE-4) — turns BE-1's token-present list into true online/offline
+    /// + backfills the homeserver BE-1 leaves null.
+    #[serde(rename = "list_accounts")]
+    ListAccounts,
+
     /// Liveness probe — fast "are you up?" round-trip that doesn't
     /// touch matrix-sdk. Not used by the in-tree stdio MCP bridge
     /// (which surfaces a daemon-down condition as a normal tool-call
@@ -332,4 +342,23 @@ mod tests {
         assert!(parsed.account.is_none());
         matches!(parsed.op, DaemonOp::UnreadCount);
     }
+
+    #[test]
+    fn list_accounts_parses_as_account_agnostic_unit_variant() {
+        // Registry-wide op: no fields, and callers omit `account`.
+        let parsed: DaemonRequest =
+            serde_json::from_str(r#"{"op":{"method":"list_accounts"}}"#).unwrap();
+        assert!(parsed.account.is_none());
+        matches!(parsed.op, DaemonOp::ListAccounts);
+        // And it serialises back to the same tagged shape.
+        let line = serde_json::to_string(&DaemonRequest {
+            account: None,
+            op: DaemonOp::ListAccounts,
+        })
+        .unwrap();
+        assert!(
+            line.contains("\"method\":\"list_accounts\""),
+            "wire: {line}"
+        );
+    }
 }