Add visible terminal control debug helpers

src/main.zig

@@ -17,6 +17,7 @@ const session = @import("session.zig");
 const socket = @import("socket.zig");
 const symbol = @import("symbol.zig");
 const syntax = @import("syntax.zig");
+const terminal_debug = @import("terminal_debug.zig");
 const tui = @import("tui.zig");
 
 pub const version = "0.1.0-dev";
@@ -600,6 +601,10 @@ test "regular: local editor client exposes save and dirty quit guards" {
     try std.testing.expect(!client.requestedQuit());
 }
 
+test "terminal debug helpers are included in main test root" {
+    _ = terminal_debug;
+}
+
 test "regular: raw terminal output converts newline to carriage-return newline" {
     const converted = try terminalCrlfAlloc(std.testing.allocator, "a\nb\n");
     defer std.testing.allocator.free(converted);