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Preserve scalar node and layer identities through Arrow imports - #1548
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Bridge imports split edge endpoint strings instead of using stored node identities. Numeric IDs/layers produce extra replicas, delimiter-containing names are truncated, and JSON-looking names such as
"null"are decoded into different values.Resolve nodes and edges through the same stored identity mapping and preserve scalar names and layer metadata verbatim.
Validation: 54 of 56 new identity cases fail on the base revision; all 77 focused identity, conversion, and Arrow tests pass with the fix.
CI caveat: existing workflows suppress pytest failures; the focused validation above was run directly.