feat: add emergency cleanup command

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

tests/test_purge.py

@@ -27,3 +27,26 @@ def test_purge_confirmed_deletes(tmp_path, monkeypatch, capsys):
     assert main(["purge", "--yes"]) == 0
     assert "Purged" in capsys.readouterr().out
     assert len(Store(state / "tamq.sqlite3").list()) == 0
+
+
+def test_feedback_chain_purge_selects_only_reflected_direction(
+    tmp_path, monkeypatch, capsys
+):
+    state = tmp_path / "state"
+    monkeypatch.setenv("TAMQ_STATE_DIR", str(state))
+    store = Store(state / "tamq.sqlite3")
+    root = store.add("a", "b", "body")
+    child = store.add("b", "a", f"body [{root}]")
+    grandchild = store.add("a", "b", f"body [{root}] [{child}]")
+    unrelated = store.add("a", "b", f"not reflected [{root}]")
+    store.close()
+
+    args = ["purge", "--feedback-chain", root]
+    assert main(args) == 0
+    assert "Dry run: 3 message(s)" in capsys.readouterr().out
+    assert len(Store(state / "tamq.sqlite3").list()) == 4
+
+    assert main([*args, "--yes"]) == 0
+    assert "Purged 3" in capsys.readouterr().out
+    remaining = Store(state / "tamq.sqlite3").list()
+    assert [row["message_id"] for row in remaining] == [unrelated]