3339255abe
tests/agent/test_lean_single_aux_call.py:163 accepted either `<seg09>` or a `content[-500:]` substring. The last slice is anchored to the newest record, so the fallback can never be what passes; assert `"<seg09>" in out` outright and drop the now-unused `content`. Red when the tail anchor is defeated (end = len(records) - 1): 1 failed; green at head (gate 2c suggestion).