fix(assets): PR #57 review — docs, uid, citation fixes

- Fix client sprite naming in README (files are _64.png, not .png)
- Clarify --path working directory (renderer/ from repo root)
- Remove /sprite-gen reference (skill not in branch yet)
- Add D-043 citation on outline color in render_export.gd
- Add uid to wall_bar_green.tscn for reproducible imports
- Note wall_bar_green has no rendered sprites yet
- Note npc_generic capsule symmetry is by design (D-044)
- Add outline + D-033 tint compatibility guidance

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

renderer/render_export.gd

@@ -10,7 +10,7 @@ const ROTATIONS: PackedFloat64Array = [0.0, 90.0, 180.0, 270.0]
 @export var model_scene: PackedScene
 @export var output_name: String = "wall_structural"
 @export var outline_width_px: int = 4  # at 256 = 1px at 64
-@export var outline_color: Color = Color(0.2, 0.2, 0.25, 1.0)
+@export var outline_color: Color = Color(0.2, 0.2, 0.25, 1.0)  # #333340 per D-043
 @export var render_now: bool = false:
 	set(value):
 		if value and model_scene: