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Brings in upstream/belt-printer (the Sept 14 main merge) plus Hanif Koh's 21 review-fix commits from PR #15685, on top of the MachineKinematics refactor and the purge-prism / tree-support / first-layer-speed fixes. Conflict resolution: - BeltGCodeWriter is gone (kinematics refactor), so Hanif's plate-offset fix for it is ported into GCodeWriter: the first-layer-plane checks in travel_to_xy / travel_to_xyz / _travel_to_z now evaluate the plate-local point, and BeltGCode::init_belt_writer hands the stored plate origin to the writer it installs. - init_belt_writer(Print&) takes Hanif's signature; the BBL flag is set on the surviving writer by GCode::_do_export. - The shared emit_belt_brim_bands() loop keeps the BeltFloorObjectGuard the local branch added, so apron bands classify first-layer height against their own object. - eager_lift keeps effective_type: it now carries set_force_normal_lift(). - GCodeWriter's initializer list follows Hanif's member order with m_kinematics in its declared position. - TreeSupport::detect_overhangs uses Hanif's clamped build_plate_tilt_slope() for the non-belt path and the belt shear for the belt path.