[Art V3][Codex] Establish realistic character direction

[BotTony329]

Summary

• establishes the Art V3 realistic Eastern dark fantasy character direction
• uses the supplied elite Southern Song veteran as the authoritative Player reference
• uses the supplied mounted armoured commander as the authoritative Gate Warden reference
• designs matching Ghost Melee, Ghost Archer, and fused-soldier Corpse Beast concepts
• adds the required lineup, silhouette, and scale approval sheets under assets_v3/review/

Why

The prior visual language is deprecated and did not meet the requested
commercial-quality anatomy, material, silhouette, or historical grounding.
This approval gate aligns all five characters before animation production.

Deliverables

• assets_v3/review/character_lineup.png
• assets_v3/review/silhouette_test.png
• assets_v3/review/scale_reference.png
• assets_v3/review/README.md

Validation

• all three PNGs decode successfully
• lineup maintains one ground plane and a shared cold-moonlight/material treatment
• silhouette sheet verifies distinct full-body contours
• scale sheet records Player 100%, Ghost Melee 105%, Ghost Archer 108%, Corpse Beast 130%, and Gate Warden 240%
• every asset is below the repository 10 MiB limit
• git diff --check passes

Approval boundary

No animation sheets, gameplay assets, Godot resources, collision data, hitboxes,
combat timing, or architecture were changed. Animation and integration
intentionally wait for lineup approval.