Arg-Met graph: scope obligate exchange and fluorescence noise to the tested reporter conditions #1431

Ecoli_K12_MG1655_Arg_Met_CrossFeeding_Coculture.yaml, PMID:42592155.

Keep both genotype-specific reciprocal exchange nodes and canonical NCBITaxon:511145 labels, without collapsing the two strains. Obligation holds under the tested amino-acid limitation; supplementation changes the interaction. The endpoint is single-cell fluorescent-reporter coefficient of variation, not directly resolved intrinsic transcriptional noise or universal protein-expression noise. Remove GO:0044419 interspecies annotation for these same-species strains. Preserve zero arrows while a separate source-backed mechanism expansion is researched; do not claim the expansion complete after node qualification. Keep the Arg-Trp and BL21/environmental-isolate experiments out of this two-strain graph.

Deduplication: 754 all-state issue titles/bodies, plus ignored/hidden-inclusive local review/research/history/tests/scripts/workflow search. Relevant #1164, #373, #1120 and #1121 read; #373 reused. Not every issue comment searched. No exact duplicate of these new findings in that scope.