fix: show static DataSet GGIO members for Open SCL and discovery

[masarray]

Problem

Signal Selection can omit static DataSet members, especially Siemens object-level FCD members such as GGIO status points. The live-discovery path already has engine-side mandatory DataSet inventory support, but the offline Open SCL mapper still filtered unresolved FCDs before they reached the selector.

The supplied Siemens CID pattern uses object-level FCDA entries (daName=""), so members like GGIO6.CBOpnd, GGIO6.CBClsd, GGIO2.TCS1Fail, GGIO2.ComFail, GGIO2.FWUpdated, and GGIO1.LocOpnCMDsta must remain visible even when a unique primary leaf is not yet resolved.

Fix

• share the ARIEC-authoritative mandatory DataSet merge between device/live inventory and arbitrary signal collections;
• in SclWorkspaceSignalMapper, apply normal operational filtering first, then merge the mandatory DataSet inventory so unresolved object-level FCD members cannot be filtered out;
• preserve explicit SCL design provenance on recovered offline rows;
• add regression coverage for realistic Siemens-style GGIO DataSet members in the Open SCL mapper.

Design constraint

This does not guess .stVal from FC=ST. If ARIEC cannot resolve a unique primary DataAttribute, ARSAS preserves the original DataSet member as an unresolved DataSet row. Engine type/VAA/SCL semantics remain authoritative.

Expected result

Signal Selection should contain every static DataSet member for both paths:

1. Open SCL/CID: mandatory members are merged directly from workspace.DesignModel.
2. IP discovery: the same service continues to merge mandatory members from device.LiveDiscoveryModel.

No user selection is auto-enabled by this change.

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[masarray]

Hardening added after the functional fix: SignalCatalogCompletenessContractTests now treats every static IEC 61850 DataSet member as non-droppable inventory evidence. The contract covers Open SCL and IP discovery, includes a Siemens-like 58/58 FCD inventory, and includes unknown vendor object names so future presentation-policy changes cannot silently remove them from Signal Selection. User selection remains independent; unresolved members remain visible rather than fabricating a leaf.