Bound yeast-alga causal loop and remove unmeasured oxygen benefit #1784

CommunityMech:000165, Saccharomyces_Chlamydomonas_Fungal_Algal_Mutualism.yaml, PMID24994654. Public primary author manuscript supports reciprocal carbon/nitrogen dependence and depicts oxygen release; it does not establish an isolated algal-oxygen benefit to yeast in the reviewed main text. Retain the two resource nodes and reciprocal directions with PARTIAL mediation limits, remove the unsupported oxygen-benefit node, and add a focused gap. Do not restore paywalled evidence or change culture/design fields. This is a graph-claim repair, not closure of the broader re-evidencing issue765.

Dedup: all-state issue titles/bodies and ignored/hidden-inclusive local search (.git/docs/site/references_cache excluded; relevant caches separately inspected). Matching issue bodies read; no duplicate found within that scope. PRs/comments not exhaustive. Source-based self-adversarial review is not independent approval. Repair issues close only after protected-main merge. No new topology or paid Edison work.