Dual monitor arm/cradle CLEVIS V2 prototype STL set

What changed from the weak first version:
- Every pivot joint is now a hinge/clevis style joint.
- The clamp pivot bosses have two flanges with a gap between them.
- Each arm has one male tab end and one clevis/fork end.
- The monitor cradle has a male tab that fits inside the final arm clevis.
- The M4 bolt now captures the inner tab between two outer flanges, reducing wobble/twist compared with single-plate pivots.

Generated parts:
- pole_clamp_left_half_35mm_pole_M4_CLEVIS.stl
- pole_clamp_right_half_35mm_pole_M4_CLEVIS.stl
- arm_180x20x20_M4_male_to_clevis_PRINT_4.stl  (print 4 copies)
- open_monitor_cradle_180x25x15_M4_male_tab_PRINT_2.stl  (print 2 copies; mirror in slicer if required)
- M4_pivot_washer_12x2_PRINT_AS_NEEDED.stl

Assembly logic:
- Clamp clevis receives arm male tab.
- Arm clevis receives next arm male tab.
- Final arm clevis receives cradle male tab.
- Use M4 bolts, nuts, and washers at every pivot. Tighten enough to remove slop but do not crush the plastic.

Key dimensions:
- Pole clearance: 35.6 mm for a 35 mm pole.
- Clamp bolts: four transverse M4 channels, not longitudinal/vertical holes.
- M4 clearance holes/channels: 4.5 mm nominal clearance.
- Link arms: 180 mm long x 20 mm wide x 20 mm high centre body.
- Male receiver tab thickness: 8.0 mm.
- Clevis fork: two 5.0 mm flanges with 9.0 mm internal gap.
- Cradle: 180 mm long, 25 mm high, 15 mm internal monitor slot, 4 mm walls.

PLA/PETG print notes:
- This is still a prototype, not a certified load-bearing monitor mount.
- Prefer PETG/ASA/nylon for real load tests; PLA is only for first fit/proportion testing.
- Use high infill/perimeters, e.g. 5+ walls and 50-80% infill.
- Print arms flat on the bed so layer lines run through the length/width, not across the bolt load path.
- Use real washers under M4 bolt heads/nuts.
- Test with dummy weight before trusting it with an actual monitor.