cap get_loose_ends todo output + add ack_todos_until bulk-clear (#2944)

hive-agent-mcp/src/mcp/args.rs

@@ -41,6 +41,20 @@ pub struct AckUntilArgs {
     pub up_to: i64,
 }
 
+/// MCP tool args for `ack_todos_until`.
+#[derive(Debug, serde::Deserialize, schemars::JsonSchema)]
+pub struct AckTodosUntilArgs {
+    /// Highest todo id to bulk-clear: every pending todo (bash-task
+    /// completions, matrix unread, forge activity) with `id <= up_to` is
+    /// acked in one call — the todo-store analogue of `ack_until` for the
+    /// message inbox. `get_loose_ends` suggests a value in its truncation
+    /// summary when there are more todos than it renders individually;
+    /// pass that value (or the highest id you've actually triaged) to
+    /// clear the backlog in one shot instead of cancelling ids one at a
+    /// time.
+    pub up_to: i64,
+}
+
 /// MCP tool args for `remind`. Exactly one of `delay_seconds` or
 /// `at_unix_timestamp` must be set; both / neither is a tool-side error.
 /// Hides the tagged `ReminderTiming` enum behind a flatter schema so the