wgt01: texture kit scaffold + shared regrade script

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

wgt01/regrade.sh

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+#!/usr/bin/env bash
+# Uniform Westgate regrade: darken, desaturate, cool tint.
+# Usage: regrade.sh <in> <out.tga>   (env: MOD, TINT, TINTPCT to override per-slot)
+set -euo pipefail
+MOD="${MOD:-65,55,100}"; TINT="${TINT:-#232830}"; TINTPCT="${TINTPCT:-12}"
+magick "$1" -modulate "$MOD" -fill "$TINT" -colorize "${TINTPCT}%" -level '0%,95%' "$2"

wgt01/textures/SOURCES.md

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+# wgt01/textures — sources & licenses
+
+| file | origin | license |
+|---|---|---|