Domain spine — System · World · Fate [Concept]

From the Meridians Wiki · Public · Maintained · joint

Every expert's canonical state rests on one measured spine. Three kinds of knowledge, kept apart because they answer different questions and are recovered differently. Scene deltas mutate the spine; forces (derivations) are deterministic reads over it — never re-parse generated prose to recover canonical state.

flowchart TB
    Scene(["a scene delta"]) -->|"mutates"| Spine

    subgraph Spine["the measured domain — src/types/domain/"]
        direction LR
        Sys["**System**<br/>rules · structures · constraints<br/>*(system.ts — the how-it-works graph)*"]
        Wor["**World**<br/>actors · places · artifacts · state<br/>*(entity.ts — the who/where/what)*"]
        Fate["**Fate**<br/>open questions + their bearing<br/>*(thread.ts — the what-might-happen)*"]
    end

    Spine -->|"deterministic derivation<br/>(forces, never authored)"| Forces(["ForceSnapshot · thread market ·<br/>positions · categories"])

Kind	Answers	Shape	File
System	how does this world work?	rules, mechanisms, institutions, conventions — a node graph	`types/domain/system.ts`
World	who / where / what is there now?	characters, locations, artifacts + their edges and state	`types/domain/entity.ts`
Fate	what might happen, and does it matter?	open outcome questions carrying priced stances	`types/domain/thread.ts`

The spine is the data substrate; the three layers of opinion (three-layers) are held over it. A Thread is Fate at long horizon; a Stream is present-day belief that resolves into Fate via a Merge; a Position is a forward read grounded in a Reasoning Graph.
The spine is measured, not narrated. Prose is a projection of it; the canonical value lives in the typed structure. This is why forces are derived and never stored — storing them would create a second source of truth that drifts.
Scene deltas are the only authoring path into the spine. Everything else (market prices, positions, categories) is a pure read.

Where it lives: src/types/domain/{system,entity,thread}.ts (the spine), src/lib/core/forces/ (the derivations over it). Vocabulary is owned by LANGUAGE.md; the model rules by ARCHITECTURE.md.