compiler: index reversed equivalent edges - #2839
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Signed-off-by: Alexander Wang <alex@terrastruct.com>
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Treats a connection and its reversed notation as one index sequence when endpoint arrowheads describe the same semantics. For example,
a -- b/b -- a,a <-> b/b <-> a, anda -> b/b <- anow receive indexes 0 and 1; the genuinely oppositeb -> aremains a separate sequence.The change applies consistently across IR lookup/indexing, compiled graph lookup, and oracle reconnect ID deltas. It also replaces the original TODO in
d2graph.Edge.initIndex.Validation: