v0.2.0 — five new gaps computed, Venus phosphine audit

Scout-rank-open-compute round. Five gaps opened with provenance and computed in the same pass (G29–G33, C26–C29, C31), plus the first specification-instrument run on public astrobiology data (C30). Highlights: ecosystem recovery has a decreasing hazard (β=0.59, 221 records); circular content is capped by core return rate; a biosignature detection at 1-in-1,000 prevalence needs 99.9% specificity; early-warning-signal hazard shapes do not discriminate (honest negative). 105 linted notes.