fix: make static DataSet inventory member-centric

[masarray]

Field failure

A real Siemens CID contains exactly 58 static FCDA/FCD members (22 Analog + 36 Digital), while Iec61850DataSetSignalInventoryProjection.GetMandatorySignals() exposed 68 semantic descriptors. ARSAS consequently could not maintain a one-to-one Signal Selection inventory and field diagnostics only represented 5/58 members.

Fix

• make mandatory DataSet inventory one descriptor per (DataSetReference, MemberIndex)
• preserve the exact static FCD/FCDA member identity in DataSetMemberships
• keep a unique primary DataAttribute only as runtime binding metadata
• when more than one primary runtime candidate exists, preserve the static member without guessing a leaf
• add regression coverage for 58/58 cardinality, resolved SPS static-vs-runtime identity, and ambiguous MV primary candidates

This changes the inventory contract from descriptor-centric to protocol-member-centric while leaving the broader signal catalog unchanged.

[chatgpt-codex-connector]

You have reached your Codex usage limits for code reviews. You can see your limits in the Codex usage dashboard.
To continue using code reviews, you can upgrade your account or add credits to your account and enable them for code reviews in your settings.