Bound mangrove coculture graph to abstract-supported outcomes #1556

kb/communities/Leptolyngbya_Pseudomonas_Mangrove_Coculture.yaml, PMID:42573630. Retain both existing observations and zero arrows. Make explicit that the reported biomass maxima are on different days (coculture day6 versus axenic day9), not a matched-time comparison. Metabolite production and physical association do not selectively establish transfer or the growth mediator; the abstract does not resolve biomass attribution to each partner. Full Methods remain inaccessible in the subscription preview. Preserve the prior fixes in closed #1154/#1155; do not duplicate their removed cross-feeding label or corrected snippet. Add an explicit source-scope gap, complete node decisions, history and regression checks. Close only after protected-main merge.

Source-based self-adversarial review, not independent approval. Existing-node/arrow repairs; no new structure or paid Edison submission.