Add the fused hand prototype (hand_l_proto/hand_r_proto) and record the finger-articulation decision

docs/blender_previews/README.md

@@ -21,6 +21,7 @@ capture harnesses.
 | [![sheet_npc_gear.jpg](sheet_npc_gear.jpg)](sheet_npc_gear.jpg) <br> `sheet_npc_gear.jpg` | Eighteen gear pieces authored in attach space: caps, hood, helmet, bags, tanks, lanyards and handheld items. |
 | [![sheet_npc_hands_compare.jpg](sheet_npc_hands_compare.jpg)](sheet_npc_hands_compare.jpg) <br> `sheet_npc_hands_compare.jpg` | Hand pass: wider palms, segmented fingers and a separate thumb. |
 | [![sheet_npc_hands_grip_compare.jpg](sheet_npc_hands_grip_compare.jpg)](sheet_npc_hands_grip_compare.jpg) <br> `sheet_npc_hands_grip_compare.jpg` | Grip pass: the forward hand-item offset that puts props in the palm. |
+| [![sheet_head_proto_before_after.jpg](sheet_head_proto_before_after.jpg)](sheet_head_proto_before_after.jpg) <br> `sheet_head_proto_before_after.jpg` | Head overhaul sign-off: current `_face` vs the s48 connected-shell prototype at 1.85 m front/three-quarter/profile. |
 | [![sheet_npc_sources_research.jpg](sheet_npc_sources_research.jpg)](sheet_npc_sources_research.jpg) <br> `sheet_npc_sources_research.jpg` | External character-source evaluation (CC0/CC-BY) for the roster research. |
 | [![sheet_props.jpg](sheet_props.jpg)](sheet_props.jpg) <br> `sheet_props.jpg` | Twenty street and venue props with baked maps, ground contact and collider footprints. |
 | [![sheet_texture_refinement_0.9.5.jpg](sheet_texture_refinement_0.9.5.jpg)](sheet_texture_refinement_0.9.5.jpg) <br> `sheet_texture_refinement_0.9.5.jpg` | 0.9.5 texture refinement before/after: pavers, awning stripes and NPC fabric. |