Separate helper peroxide protection from qualified CO2 catalase mediation #1721

CommunityMech:000131; PMID:29087377; doi:10.1038/ismej.2017.189 (PMID29087378). Preserve three nodes and both existing directions. Keep the positive peroxide-scavenging-to-growth mechanism. Remove unsupported COLONIZATION_FACILITATION and neutral-benefit COMMENSALISM categories: facilitation of the phototroph alone does not establish the helper is unaffected. Restrict detoxification wording to measured hydrogen peroxide, not all ROS. Preserve reduced catalase transcripts, approximately sixfold lower coculture peroxide removal, and longer post-transfer lag/apparent die-off under elevated CO2; qualify the catalase-specific causal chain rather than treating transcription as necessity/rescue proof. CO2 and thermal studies are separate assays. Fresh abstracts read; publisher exposed introduction/early methods of temperature paper, but subsequent full-text requests failed. Close only after protected-main merge.

All-state issue titles/bodies searched by exact IDs, PMIDs, DOIs and stems. Closed #258 concerns prior dangling-edge repair; #419 mentions honest broad Prairie taxon grounding. Neither resolves these semantic findings. Local ignored/hidden files included, with .git/docs/site/references_cache exclusions; relevant caches separately checked. Comments and PRs not exhaustive. Self-adversarial source review, not independent approval.