fix: restore interactive PTY behavior

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

tests/test_ptytap.py

@@ -0,0 +1,56 @@
+import fcntl
+import os
+import pty
+import struct
+import termios
+
+from tamq.ptytap import PtyTap, copy_winsize, write_all
+
+
+class RecordingBroker:
+    def __init__(self):
+        self.lines = []
+
+    def inspect_line(self, line):
+        self.lines.append(line)
+        return line.startswith("@")
+
+
+def test_input_observer_accepts_raw_terminal_carriage_returns():
+    broker = RecordingBroker()
+    observed = []
+    tap = PtyTap(["true"], broker, on_line=observed.append)
+    buffer = bytearray()
+
+    tap._observe_input(buffer, b"@activity-core: hel")
+    tap._observe_input(buffer, b"lo\rplain line\n")
+
+    assert broker.lines == ["@activity-core: hello", "plain line"]
+    assert observed == ["@activity-core: hello"]
+
+
+def test_copy_winsize_preserves_rows_columns_and_pixels():
+    source_master, source_slave = pty.openpty()
+    target_master, target_slave = pty.openpty()
+    expected = struct.pack("HHHH", 41, 103, 900, 1600)
+    try:
+        fcntl.ioctl(source_slave, termios.TIOCSWINSZ, expected)
+        assert copy_winsize(source_slave, target_master) is True
+        actual = fcntl.ioctl(target_slave, termios.TIOCGWINSZ, b"\0" * 8)
+        assert actual == expected
+    finally:
+        for fd in (source_master, source_slave, target_master, target_slave):
+            os.close(fd)
+
+
+def test_write_all_retries_partial_writes(monkeypatch):
+    writes = []
+
+    def partial_write(fd, data):
+        chunk = bytes(data[:2])
+        writes.append((fd, chunk))
+        return len(chunk)
+
+    monkeypatch.setattr(os, "write", partial_write)
+    write_all(9, b"abcde")
+    assert writes == [(9, b"ab"), (9, b"cd"), (9, b"e")]