Filter ANSI output before Slack forwarding

tests/test_output_filter.py

@@ -0,0 +1,18 @@
+"""output_filter 모듈 테스트."""
+
+from lazy_enter.output_filter import clean_terminal_output
+
+
+def test_clean_terminal_output_removes_ansi_sequences():
+    raw = "\x1b[?2004h\x1b[38;2;153;153;153mClaude Code\x1b[39m"
+    assert clean_terminal_output(raw) == "Claude Code"
+
+
+def test_clean_terminal_output_removes_broken_csi_tokens():
+    raw = "[?2004h[38;2;153;153;153mhello[39m"
+    assert clean_terminal_output(raw) == "hello"
+
+
+def test_clean_terminal_output_preserves_plain_text():
+    raw = "line1\nline2"
+    assert clean_terminal_output(raw) == "line1\nline2"