feat(research): ablations, broadcast and self-model experiments, counterfactuals

A framework for testing functional properties of the architecture
(Part C). None of it claims consciousness; every measure has an
operational definition in research.Measures.

- Ablations (attention, memory retrieval, affect, metacognition,
  commitments, volition, global workspace, curiosity, association, goals,
  narrative, notifications) and workspace overrides (force a matching
  candidate in or out of admission) live in a fork's cognitive
  configuration. Original minds refuse them on create and update; only
  snapshot restores may carry them, so they are part of the configuration
  digest. Excluded candidates are recorded with fate "excluded".
- Self-model experiments override a fork's self-model (capabilities,
  identity, goals, knowledge gaps) without touching policy. When an
  action's effective policy disagrees with the self-model, cognition
  records a self_model_mismatch and corrects the entry; experiments report
  self-model accuracy and correction latency.
- Counterfactual experiments replay a mind's recorded stimuli from a
  snapshot with chosen events omitted; the report lists what differed in
  beliefs, wants, intentions, memories, attention and capability
  decisions, in a form introspection can cite.
- Experiments record a protocol (kind, independent variable, controlled
  variables, measures), per-variant volition, plan, downstream-by-category
  (events reachable from each stimulus through recorded links),
  introspection and self-model measures and event ranges; comparisons add
  want, intention and plan-capability overlap, measure ranges, a
  descriptive architecture share and a downstream delta; reproducibility
  is labelled against the previous run of the same definition.
- research.Agency computes want→intention, intention→action, abandonment,
  commitment fulfilment and conflict, blocked intentions, replanning,
  outcome success and introspection accuracy; MetacognitiveCalibration
  relates confidence and expressed uncertainty in replies to later belief
  revision, with Brier scores for each half of the period.
- The sandbox test harness gains volition, planning, agency and research
  but not the motivation hook, whose wall-clock decay would make replay
  comparisons timing-dependent.

internal/snapshots/archive.go

@@ -513,7 +513,7 @@ func (s *Store) restoreNew(ctx context.Context, a Archive, o *ForkOptions) (mind
 	if notes == "" {
 		notes = "restored from archive of " + a.Source.Slug + " at event " + fmt.Sprint(a.Source.EventSeq)
 	}
-	m, err := s.Minds.Create(ctx, minds.CreateParams{Slug: o.Slug, DisplayName: o.DisplayName, Personality: &p, Config: &cfg, Notes: notes, CreatedBy: o.By})
+	m, err := s.Minds.Create(ctx, minds.CreateParams{Slug: o.Slug, DisplayName: o.DisplayName, Personality: &p, Config: &cfg, Notes: notes, CreatedBy: o.By, Research: true})
 	if err != nil {
 		return minds.Mind{}, err
 	}