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Round-2 cmd.jsonl from shaddowlink proves the bridge forwards both commands and responses correctly: ams_filament_setting round-trips with result=success on P1S, the cached push_status carries tray_info_idx=GFA11/tray_type=PLA-AERO/K-n/cali_idx intact, and the visible "unload" symptom comes from the slicer's choice of extrusion_cali_set (push K direct, P1S firmware rejects) vs extrusion_cali_sel (select by id, both H2D and P1S accept). The open question is what makes the slicer pick _set vs _sel — likely the info.get_version response Bambuddy synthesises or the first cached pushall reply the slicer reads at connect. Round 2 captured neither; the JSONL had slicer_to_bridge and printer_to_slicer but no direction for the bridge's own synthesised replies. Same BAMBUDDY_VP_DUMP_WIRE=1 flag now also appends a bridge_to_slicer line for every bridge-synthesised reply (info.get_version answer, project_file ack, on-demand pushall response). Capture is in _publish_to_report — the single chokepoint — gated on a new log_event param; the 1Hz periodic push threads log_event=False so the JSONL isn't flooded (~60 lines/min/VP) because dump_wire already covers cache shape per tick. Diagnostic-only, no data-path change. Default param preserves every existing call site's behaviour.