feat(experiments): cognitive forks per model with per-mind routing and comparison

A mind's configuration may override model routing per role (llm_roles);
the router honours it for that mind only and fails closed when the named
model is missing or disabled, so a comparison between providers can never
silently fall back to the default. Experiments may declare variants: each
becomes its own fork of the same snapshot with its own configuration,
personality or routing, receives identical stimuli, and is measured. The
results carry one entry per variant and a deterministic comparison: first
divergent stimulus, belief and attention overlap, mean score difference on
shared propositions, and the ranges of memory counts, goal counts, cost and
capability requests. Single-subject definitions are unchanged.
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Andy Dixon
2026-08-20 22:26:42 +01:00
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Language models are **cognitive service providers**. Cognitive code never names a vendor; it asks the router for a *role* and receives a response with a call id it can cite as evidence (ADR-0004).
## Per-mind routing
A mind's cognitive configuration may carry `llm_roles`, a map from role to model id, which overrides the daemon-wide routing for that mind alone. It exists so that forks of one snapshot can run on different providers in a controlled experiment. An override names exactly one model; if that model is missing or disabled the call fails with "no model" rather than falling back, and the runtime identity records the override next to the daemon routing.
## Roles
| Role | Used for | Suggested tier |