termio: send VT220 device attributes on request, add secondary

src/terminal/stream.zig

@@ -514,7 +514,7 @@ pub fn Stream(comptime Handler: type) type {
                         switch (action.params.len) {
                             1 => @enumFromInt(action.params[0]),
                             else => {
-                                log.warn("invalid erase characters command: {}", .{action});
+                                log.warn("invalid device status report command: {}", .{action});
                                 return;
                             },
                         },

src/termio/Exec.zig

@@ -1297,9 +1297,17 @@ const StreamHandler = struct {
     ) !void {
         _ = params;
 
+        // For the below, we quack as a VT220. We don't quack as
+        // a 420 because we don't support DCS sequences.
         switch (req) {
-            // VT220
-            .primary => self.messageWriter(.{ .write_stable = "\x1B[?62;c" }),
+            .primary => self.messageWriter(.{
+                .write_stable = "\x1B[?62;22c",
+            }),
+
+            .secondary => self.messageWriter(.{
+                .write_stable = "\x1B[>1;10;0c",
+            }),
+
             else => log.warn("unimplemented device attributes req: {}", .{req}),
         }
     }