Filter Codex TUI redraw noise in Slack output

tests/test_output_filter.py

@@ -16,3 +16,28 @@ def test_clean_terminal_output_removes_broken_csi_tokens():
 def test_clean_terminal_output_preserves_plain_text():
     raw = "line1\nline2"
     assert clean_terminal_output(raw) == "line1\nline2"
+
+
+def test_clean_terminal_output_removes_broken_charset_tokens():
+    raw = "=(Bhello(B"
+    assert clean_terminal_output(raw) == "=hello"
+
+
+def test_clean_terminal_output_filters_codex_tui_redraw_noise():
+    raw = """=(B╭─────────────────────────────────────────────╮(B
+│ >_ OpenAI Codex (v0.101.0)                  │(B
+│ model:     gpt-5.3-codex   /model to change │(B
+│ directory: ~/repos/The-Ouroboros            │(B
+╰─────────────────────────────────────────────╯(B
+Tip: New Codex is included in your plan for free
+› Find and fix a bug in @filename
+? for shortcuts
+100% context left
+Assistant: 작업을 시작합니다.
+"""
+    assert clean_terminal_output(raw) == "Assistant: 작업을 시작합니다."
+
+
+def test_clean_terminal_output_removes_box_empty_line_noise():
+    raw = "│                                             │\n› Explain this codebase\n"
+    assert clean_terminal_output(raw) == "› Explain this codebase"