experiment: E4_multiteacher_decorrelation
kind: coverage
seed: 20260704
n_replicates: 200

# Multi-teacher recombination (blueprint 2.5-E4 / 2.7.1). Build K_T teachers with exact
# marginal retention q and pairwise retention-correlation rho, form the pupil from their
# mixture (n draws total = matched budget), and report TWO coverages:
#   union_coverage    -> construction-level U(K_T,rho,q) (must match the closed form)
#   surviving_coverage-> tail items that survive the pupil's size-n resampling (+ grounding)
# Expect: both rise with K_T and (1-rho); at rho=1 many teachers give no benefit over one;
# the union-surviving gap shrinks as grounding g rises.
truth:
  K: 500
  R: 1
  tail: zipf
  zipf_s: 1.1
  tail_frac: 0.5
  tail_threshold: 2.0e-3

coverage:
  n: 300          # pupil sample size (matched budget across teachers)
  q: 0.5          # per-teacher marginal tail retention

sweep:
  - param: K_T
    values: [1, 2, 3, 5]
  - param: rho
    values: [0.0, 0.25, 0.5, 0.75, 1.0]
  - param: g
    values: [0.0, 0.02, 0.05]

output:
  dir: results/figS8_multiparent_union