- Resolve exact Diablo II v1.13c DS1 Type-2 Object #33 (Objects.txt ID 59) Town Portal sub-tiles across all 9 town presets (Acts 1-5) in src/game/portal.ts
- Implement TownPortalSlot.mouthInLevel(levelId) and enterFrom(levelId) per ObjMode.cpp:3245 (wilderness -> town keeps portal open; town -> wilderness closes portal)
- Add 20-charge quantity tracking for Tome of Town Portal (tbk) and Tome of Identify (ibk), right-click casting for tbk/tsc in inventory, and scroll-to-tome refill
- Bake authentic TP DCC sprite atlases (tptrlitophth, tphdlitophth, tptrlitonhth, tphdlitonhth) into public/overlays/town_portal_*
- Render Town Portal entity with OP/ON DCC animation, dynamic blue light (Light=19, RGB 64/110/255), overhead destination label, and proximity walk-to-interact in src/scene/act-scene.ts
- Add unit and parity tests in tests/town-portal.test.ts
Closes#394