- Add end_experiment manual_confirm action mirroring start_experiment, with three boolean operator gates and twelve EXECUTOR sibling-array output handles for unloaded material manifests.
- Add helpers _build_unload_materials_by_type, _classify_labware_mode, _iter_reagent_liquids, and _clear_unloaded_materials.
- Clear unloaded slots and zero reagent liquid contents on confirmation while preserving trough labware; publish single resource tree update after mutations.
- Wrap action body in _debug_call_session("end_experiment") for opt-in raw call capture.
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