P5.4: project structured report members to semantic scalar leaves

[masarray]

P5.4 — semantic structured report projection

Physical FAT validation exposed structured DataSet members such as I_MHAI1.ThdA and V_MHAI1.ThdPPV that arrive as structured InformationReport values. The baseline projector intentionally left these values raw, so scalar phase descendants did not reach the application live-point path.

This change keeps static DataSet membership identity immutable and adds a fail-closed semantic overlay:

• consumes the existing LiveIedModelDiscoveryDocument / DataSet semantic binding authority; no second SCL parser;
• preserves exact static DataSet member identity and member index;
• maps positional MMS structure only below that exact member boundary using model attribute declaration order;
• fans out every schema-proven scalar descendant instead of selecting a sibling phase;
• keeps whole multi-phase membership ambiguous (PrimaryValue == null) when no unique scalar primary exists;
• on schema/value shape mismatch, preserves baseline raw projection and emits semantic fallback instead of guessing;
• leaves existing known CDC projection unchanged.

Physical evidence

Physical-proven engine head before consolidation:

b9ee5fc9650b72e69bc81287a1e1b047ad19b054

ARSAS physical retest on AA1E1F03R5 / 192.168.81.114 proved the six scalar THD children live-bound without forcing IED quality:

• ThdA.phsA
• ThdA.phsB
• ThdA.phsC
• ThdPPV.phsAB
• ThdPPV.phsBC
• ThdPPV.phsCA

The structured parents remain non-scalar by design.

Consolidation with current main

Current G2.7 main at consolidation time:

c979206988ebcbaf79e62b784895e19547184369

Consolidated PR head:

9fba1cff11c475519d829956d82e7bd5f2b541cf

The consolidation is a merge commit with the physical-proven P5.4 head as first parent and current G2.7 main as second parent. The five P5.4 semantic source/regression files are carried with the exact blob contents from the physical-proven head; all other repository content comes from current main.

Compared with current main, this PR still changes exactly five files:

• src/AR.Iec61850/Discovery/Iec61850DataSetSemanticBindingResolver.cs
• src/AR.Iec61850/Discovery/Iec61850DataSetSignalInventoryProjection.cs
• src/AR.Iec61850/Mms/MmsSemanticReportValueProjector.cs
• tests/AR.Iec61850.Tests/Discovery/Iec61850StructuredDataSetMemberBindingTests.cs
• tests/AR.Iec61850.Tests/Mms/MmsSemanticReportValueProjectorTests.cs

Gate

PR remains DRAFT + UNMERGED until:

1. exact consolidated-head .NET CI is green;
2. ARSAS is re-pinned to the consolidated engine SHA;
3. a targeted matching-relay/CID regression confirms the physical THD behavior remains intact on the consolidated head.

The old b9ee5fc... physical proof is retained as provenance; it is not automatically transferred to the new consolidated SHA.

[masarray]

Consolidation completed without merging to main.

• physical-proven P5.4 parent: b9ee5fc9650b72e69bc81287a1e1b047ad19b054
• current G2.7 main parent: c979206988ebcbaf79e62b784895e19547184369
• consolidated head: 9fba1cff11c475519d829956d82e7bd5f2b541cf
• diff versus current main: still exactly the five P5.4 semantic source/regression files
• .NET CI #437 / run 33702213047: currently in progress

The PR remains DRAFT + UNMERGED. The old physical proof is retained as provenance; exact consolidated-head physical GO is not claimed until ARSAS is repinned and the matching relay/CID receives a targeted regression.