186bf25cb1
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Regression guard for #30770 — verifies the guardrail-halt branch in agent/conversation_loop.py pushes the synthesized halt message through stream_delta_callback before breaking out of the loop. Without the emit, chat-completions SSE writers drain an empty queue and clients (Open WebUI, etc.) see a finish chunk with zero content delta — indistinguishable from a crash. Verified: the test fails when the production fix is reverted.