experiment: E1_reproduce_collapse
seed: 20260704
n_replicates: 100
generations: 600

# Null model (blueprint 2.5-E1): no grounding, single teacher, no selection.
# Starting from the truth makes the collapse narrative clean -- the tail is lost first,
# support shrinks to 1, forward-KL diverges, and H decays geometrically at rate 1/n.
# (The decay law E[H_t]=H_0(1-1/n)^t holds from any start; see the validation suite.)
truth:
  K: 500
  R: 1
  tail: zipf
  zipf_s: 1.1
  tail_frac: 0.5
  tail_threshold: 1.0e-3
  init: truth

dynamics:
  n: 100                 # distillation sample size = drift strength
  teachers: {K_T: 1, rho: 0.0, q: 1.0}
  grounding: {m: 0, policy: proportional}
  selection: {mode: none, novelty_alpha: 0.0}
  remint: {enabled: false, period: null, H_gate: null}

metrics:
  kl_floor: 1.0e-9
  support_eps: 1.0e-9

# No sweep: a single condition.
output:
  dir: results/collapse_null