Interface domain: Environment

Status: EXPERIMENTAL capability domain — NOT a normative specification (docs/interface-model.md §2). Adding required semantics here is a proposal, not an edit.

Purpose. What the world can currently support: the fourteen environmental dimensions (docs/coordinate-system.md §1.4). The primary coordinate.

Wire format. schemas/wire/signal.schema.json — SPECIFIED.

Open questions. Aggregation semantics (how multiple signals compose into one supportable-capacity estimate) are implementation-defined; whether a minimal composition contract is needed.

Formalization trigger. Two signal providers whose outputs a single consumer cannot combine without bilateral negotiation.