E0c — junction/spine hybrids on the curved toy (exact truth)

Setup: E0-curved protocol, 20 held-out seeds, sparse levels only (where the division of labour lives). Hybrids are sums/maxima of percentile-normalised parent scores; identical matched-length pipeline.

n_gal	method	completeness	purity	junction F1	ΔC vs best parent (p)	ΔjF1 vs best parent (p)
2500	hessian	0.916 ± 0.018	0.780	0.493 ± 0.049	—	—
2500	se3_lift	0.897 ± 0.024	0.792	0.437 ± 0.058	—	—
2500	hyb_sum	0.921 ± 0.022	0.829	0.483 ± 0.050	+0.005 vs hessian (0.28)	-0.010 vs hessian (0.18)
2500	hyb_max	0.900 ± 0.023	0.793	0.440 ± 0.067	-0.016 vs hessian (0.0056)	-0.053 vs hessian (6.3e-05)
5000	hessian	0.954 ± 0.010	0.872	0.514 ± 0.057	—	—
5000	se3_lift	0.911 ± 0.031	0.867	0.495 ± 0.067	—	—
5000	hyb_sum	0.935 ± 0.023	0.924	0.553 ± 0.057	-0.019 vs hessian (9.5e-06)	+0.040 vs hessian (0.00013)
5000	hyb_max	0.912 ± 0.027	0.866	0.490 ± 0.069	-0.042 vs hessian (1.9e-06)	-0.024 vs hessian (0.027)