feat: TextGate node — pause, editable pass-through, signal passthrough

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_textgate.py

@@ -1,7 +1,18 @@
 # tests/test_textgate.py
+import math
+
 from gates import textgate
 
 def test_anytype_is_compatible_with_everything():
     assert (textgate.ANY != "IMAGE") is False
     assert (textgate.ANY != "LATENT") is False
     assert isinstance(textgate.ANY, str)
+
+def test_textgate_io_shape():
+    assert textgate.TextGate.RETURN_NAMES == ("text", "signal")
+    assert textgate.TextGate.RETURN_TYPES[0] == "STRING"
+    assert textgate.TextGate.RETURN_TYPES[1] == textgate.ANY
+
+def test_textgate_is_changed_nan():
+    v = textgate.TextGate.IS_CHANGED(text="hi", unique_id="1")
+    assert math.isnan(v)