experiment: E11
kind: dynamic_society
seed: 20260705
n_replicates: 12

# (The dynamic Lamarckian society — the vertical claim, C3): a finite population of agents (genotypes)
# evolves on a rugged NK fitness landscape that IS reality. The full society composes the four
# operators the whole study built toward — grounding, directed recombination (sex), quality-diversity
# selection, and mutation — and a 4-arm ablation shows each is load-bearing. Grounding is made load-
# bearing via the consensus-conformity (self-consumption) mechanism: selection acts on
# g*true_fitness + (1-g)*conformity, so at g=0 the society optimises agreement with its own majority
# rather than reality and drifts to a fit-looking but actually-poor consensus. Expect: FULL climbs to
# near the global optimum while maintaining diversity longest; NO_GROUNDING collapses to the unfit
# consensus; NO_SEX plateaus (can't recombine to escape local optima); NO_DIVERSITY (greedy) collapses
# diversity fast and stalls at a worse local optimum. Falsifier: an ablation matches the full society,
# or the full society fails to exceed every ablation.

society:
  L: 12
  K: 8               # landscape ruggedness (epistasis) — rugged enough that diversity + sex matter
  N: 60              # population size
  g: 0.85            # grounding fraction (overwritten to 0 in the no_grounding arm)
  mu: 0.03           # per-locus mutation rate
  novelty: 0.5       # quality-diversity weight (0 in the no_diversity/greedy arm)
  n_off: 120         # directed-recombination offspring pool per generation
  recomb_rate: 0.2   # crossover rate
  sex: true          # directed recombination on (false in the no_sex arm)
  select: qd         # quality-diversity survival (greedy in the no_diversity arm)

generations: 80

sweep:
  - param: arm
    values:
      - {name: full,         set: {}}
      - {name: no_grounding, set: {society.g: 0.0}}
      - {name: no_sex,       set: {society.sex: false}}
      - {name: no_diversity, set: {society.select: greedy, society.novelty: 0.0}}

output: {dir: results/E11}