Interface CommandContributions

Per-bucket command contributions a class can declare via static commandContributions: CommandContributions. Mixins, concrete Stuff classes, and shadows all use the same shape.

Each bucket holds YAML filenames; CommandApi.getCommand resolves them at runtime.

• self — commands the host can issue against itself (e.g. inventory, look).
• inventory — commands the host gains when this thing is in its inventory (e.g. a wand grants zap).
• environment — commands the host gains when this thing is in its environment (e.g. a notice board grants read).
• peers — commands the host gains when this thing is a peer CommandGiver in its environment (e.g. a conversational NPC grants tell).

Discovery looks for the bucket as either a filename array or undefined (treated as no contribution). Empty arrays are fine.