test: add highlighted outputs for Tcl shebang regression tests

Generate highlighted test outputs for tclsh, wish, and expect
shebang detection files to prevent regressions.

tests/integration_tests.rs

@@ -4201,6 +4201,8 @@ fn plain_without_diff_still_works() {
         .assert()
         .success()
         .stdout("line 1\nline 2 modified\nline 3\nline 4 added\n");
+}
+
 #[test]
 fn tcl_shebang_detection_tclsh() {
     bat()

tests/syntax-tests/highlighted/Tcl/expect_shebang

@@ -0,0 +1,7 @@
+#!/usr/bin/expect -f
+# Expect script detected via expect shebang
+set timeout 30
+spawn ssh user@host
+expect "password:"
+send "secret\r"
+expect eof

tests/syntax-tests/highlighted/Tcl/tclsh_shebang

@@ -0,0 +1,7 @@
+#!/usr/bin/env tclsh
+# Tcl script detected via tclsh shebang
+puts "Hello from tclsh"
+set x 42
+if {$x > 0} {
+    puts "positive"
+}

tests/syntax-tests/highlighted/Tcl/wish_shebang

@@ -0,0 +1,5 @@
+#!/usr/bin/wish
+# Tk script detected via wish shebang
+package require Tk
+button .b -text "Click" -command {puts "clicked"}
+pack .b