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/classes/CLASSES.md

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+# Class TOML Reference
+
+Each file in `world/classes/` defines one class. The filename (without `.toml`) becomes the class ID with prefix `class:` (e.g. `warrior.toml` → `class:warrior`).
+
+## Top-level fields
+
+| Field | Type | Required | Default | Description |
+|-------|------|----------|---------|-------------|
+| `name` | string | Yes | — | Display name of the class. |
+| `description` | string | Yes | — | Short description shown in chargen. |
+| `hidden` | boolean | No | `false` | If `true`, the class does not appear in character creation. Use for NPC-only classes (e.g. Peasant, Creature). |
+| `guild` | string | No | — | Guild ID (e.g. `"guild:warriors_guild"`). If set, new characters who choose this class automatically join this guild at level 1 and receive that guild’s base mana/endurance. |
+
+## `[base_stats]` — Starting stats at level 1
+
+| Field | Type | Required | Default | Description |
+|-------|------|----------|---------|-------------|
+| `max_hp` | integer | No | `0` | Base maximum HP before race/stat modifiers. |
+| `attack` | integer | No | `0` | Base attack before modifiers. |
+| `defense` | integer | No | `0` | Base defense before modifiers. |
+
+## `[growth]` — Per-level gains
+
+| Field | Type | Required | Default | Description |
+|-------|------|----------|---------|-------------|
+| `hp_per_level` | integer | No | `0` | HP added each level. |
+| `attack_per_level` | integer | No | `0` | Attack added each level. |
+| `defense_per_level` | integer | No | `0` | Defense added each level. |
+
+## Minimal example (hidden NPC class)
+
+```toml
+name = "Peasant"
+description = "A common folk with no particular training."
+hidden = true
+
+[base_stats]
+max_hp = 50
+attack = 4
+defense = 4
+
+[growth]
+hp_per_level = 5
+attack_per_level = 1
+defense_per_level = 1
+```
+
+## Example with guild (playable class)
+
+```toml
+name = "Warrior"
+description = "Masters of arms and armor."
+guild = "guild:warriors_guild"
+
+[base_stats]
+max_hp = 120
+attack = 14
+defense = 12
+
+[growth]
+hp_per_level = 15
+attack_per_level = 3
+defense_per_level = 2
+```