wgt01: tileset build guide + 40-tile generator kit

AGENTS.md: NWN:EE tileset construction reference (constraints, .mdl/.wok
walkmesh rules, .set format, Blender->NWN pipeline, prototype->NWN mapping).

wgt01/: Westgate Urban Foundation MVP kit.
- generator/tiles.py: single source of truth (40-tile table, materials,
  12x12 test map, pure paint/height/walkmesh/.set derivations).
- generator/build.py: Blender 4.0.2 scene generator (VIS_/WOK_/BLOCK_ per
  tile, edge metadata, library grid + 12x12 district previews).
- generator/make_wok.py: ASCII walkmesh emitter (verts+faces+surfacemat+AABB
  tree) from the same geometry.
- generator/make_set.py: first-pass twu01.set (CRLF) from the tile grammar.
- flake.nix: build/wok/set apps + dev shell (pinned Blender 4.0.2, NWN tools).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitattributes

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+# =========================
+# Neverwinter Nights - LFS Assets
+# =========================
+
+# -------------------------
+# Audio / Video
+# -------------------------
+*.wav filter=lfs diff=lfs merge=lfs -text
+*.bmu filter=lfs diff=lfs merge=lfs -text
+*.mp3 filter=lfs diff=lfs merge=lfs -text
+*.mp4 filter=lfs diff=lfs merge=lfs -text
+*.bik filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# Images / Textures
+# -------------------------
+*.tga filter=lfs diff=lfs merge=lfs -text
+*.dds filter=lfs diff=lfs merge=lfs -text
+*.plt filter=lfs diff=lfs merge=lfs -text
+*.png filter=lfs diff=lfs merge=lfs -text
+*.tif filter=lfs diff=lfs merge=lfs -text
+*.psd filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# 3D Models / Geometry
+# -------------------------
+*.mdl filter=lfs diff=lfs merge=lfs -text
+*.mdx filter=lfs diff=lfs merge=lfs -text
+*.fbx filter=lfs diff=lfs merge=lfs -text
+*.blend filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# Walkmeshes / Collision
+# -------------------------
+*.wok filter=lfs diff=lfs merge=lfs -text
+*.pwk filter=lfs diff=lfs merge=lfs -text
+*.dwk filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# NWN Tileset / Layout
+# -------------------------
+*.lyt filter=lfs diff=lfs merge=lfs -text
+*.vis filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# NWN GFF Files (CORE)
+# -------------------------
+*.are filter=lfs diff=lfs merge=lfs -text
+*.git filter=lfs diff=lfs merge=lfs -text
+*.ifo filter=lfs diff=lfs merge=lfs -text
+*.dlg filter=lfs diff=lfs merge=lfs -text
+*.fac filter=lfs diff=lfs merge=lfs -text
+*.jrl filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# NWN Objects (GFF-based)
+# -------------------------
+*.utc filter=lfs diff=lfs merge=lfs -text
+*.utp filter=lfs diff=lfs merge=lfs -text
+*.uti filter=lfs diff=lfs merge=lfs -text
+*.utd filter=lfs diff=lfs merge=lfs -text
+*.uts filter=lfs diff=lfs merge=lfs -text
+*.utm filter=lfs diff=lfs merge=lfs -text
+*.utw filter=lfs diff=lfs merge=lfs -text
+*.ute filter=lfs diff=lfs merge=lfs -text
+*.utt filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# Character Files
+# -------------------------
+*.bic filter=lfs diff=lfs merge=lfs -text
+
+# -------------------------
+# NWN Misc
+# -------------------------
+*.gff filter=lfs diff=lfs merge=lfs -text
+*.gic filter=lfs diff=lfs merge=lfs -text