feat: add reliable trigger and worker message blocks

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a03397-4d51-7fd1-8ff2-946eb22ea2bc

tests/test_ptytap.py

@@ -104,6 +104,24 @@ def test_output_observer_preserves_full_screen_program_gutters():
     assert lines == ["› To:target: operator echo", "• tO:target: worker reply"]
 
 
+def test_output_observer_emits_one_empty_line_for_crlf_terminator():
+    lines = []
+    observer = TerminalOutputObserver(lines.append)
+    observer.feed(b"To:target: first\r\nfollowup\r\n\r\nordinary\r\n")
+    assert lines == ["To:target: first", "followup", "", "ordinary"]
+
+
+def test_output_observer_infers_empty_full_screen_row_from_cursor_gap():
+    lines = []
+    observer = TerminalOutputObserver(lines.append)
+    observer.feed(
+        b"\x1b[4;1H\xe2\x80\xa2 To:target: first"
+        b"\x1b[5;1H  followup"
+        b"\x1b[7;1Hprompt"
+    )
+    assert lines == ["• To:target: first", "  followup", ""]
+
+
 def test_copy_winsize_preserves_rows_columns_and_pixels():
     source_master, source_slave = pty.openpty()
     target_master, target_slave = pty.openpty()