Add TOML reference docs for all world data types

- world/MANIFEST.md: manifest.toml and directory layout
- world/races/RACES.md: race schema (stats, body, natural, resistances, etc.)
- world/classes/CLASSES.md: class schema (base_stats, growth, hidden, guild)
- world/guilds/GUILDS.md: guild schema and [growth]
- world/spells/SPELLS.md: spell schema and types
- world/town/REGION.md: region.toml
- world/town/rooms/ROOMS.md: room schema and exits
- world/town/npcs/NPCS.md: NPC schema, race/class resolution
- world/town/objects/OBJECTS.md: object schema and [stats]

Made-with: Cursor

world/MANIFEST.md

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+# World Manifest Reference
+
+The file `world/manifest.toml` defines the world identity and spawn location. There is exactly one manifest per world.
+
+## Fields
+
+| Field | Type | Required | Description |
+|-------|------|----------|-------------|
+| `name` | string | Yes | World name (e.g. shown at login). |
+| `spawn_room` | string | Yes | Full room ID where new characters and respawned dead characters appear (e.g. `"town:town_square"`). Must reference an existing room. |
+
+## Example
+
+```toml
+name = "The Shattered Realm"
+spawn_room = "town:town_square"
+```
+
+## Directory layout
+
+The loader expects (under `world/`):
+
+- `manifest.toml` — this file
+- `races/*.toml` — race definitions (see `races/RACES.md`)
+- `classes/*.toml` — class definitions (see `classes/CLASSES.md`)
+- `guilds/*.toml` — guild definitions (see `guilds/GUILDS.md`)
+- `spells/*.toml` — spell definitions (see `spells/SPELLS.md`)
+- `<region>/` — one folder per region (e.g. `town/`), each containing:
+  - `region.toml` — region metadata (see `town/REGION.md`)
+  - `rooms/*.toml` — rooms (see `town/rooms/ROOMS.md`)
+  - `npcs/*.toml` — NPCs (see `town/npcs/NPCS.md`)
+  - `objects/*.toml` — objects (see `town/objects/OBJECTS.md`)
+
+Folder names `races`, `classes`, `guilds`, and `spells` are reserved; other top-level directories are treated as regions.