Establish the 0.9.4 NPC visual baseline

Add a neutral 48-frame character contact sheet, acceptance criteria and ranked baseline gaps, plus repeatable sheet/comparison tooling. No character GLB or runtime mesh changes.

docs/blender_previews/README.md

@@ -43,6 +43,7 @@ Committed contact sheets and local Blender renders for the character, gear and p
 | <img src="security_podium.png" width="280" alt="security_podium.png"> | [`security_podium.png`](security_podium.png) |
 | <img src="sedan.png" width="280" alt="sedan.png"> | [`sedan.png`](sedan.png) |
 | <img src="sheet_npc.jpg" width="280" alt="sheet_npc.jpg"> | [`sheet_npc.jpg`](sheet_npc.jpg) |
+| <img src="sheet_npc_baseline.jpg" width="280" alt="sheet_npc_baseline.jpg"> | [`sheet_npc_baseline.jpg`](sheet_npc_baseline.jpg) |
 | <img src="sheet_npc_gear.jpg" width="280" alt="sheet_npc_gear.jpg"> | [`sheet_npc_gear.jpg`](sheet_npc_gear.jpg) |
 | <img src="sheet_props.jpg" width="280" alt="sheet_props.jpg"> | [`sheet_props.jpg`](sheet_props.jpg) |
 | <img src="shoulder_bag.png" width="280" alt="shoulder_bag.png"> | [`shoulder_bag.png`](shoulder_bag.png) |