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/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