fix: expose complete static DataSet inventory and diagnostics

[masarray]

Problem

ARSAS could still hide Siemens static DataSet members such as cross-LDevice GGIO object-level FCD entries because the SCL engine projection used a different reference identity from the live DataObject model. Existing synthetic tests did not exercise the actual SCL parser/projection path.

Engine dependency

Pins ARIEC61850 main at 4fc3119be2bb97e0ea3a8d31fb990e6a1a089e60 (PR #77), which canonicalizes parser FCDA references such as IED/LD/GGIO6.CBOpnd [ST] to the live-model identity IEDLD/GGIO6.CBOpnd, while keeping FC separately and never inventing .stVal for object-level FCD members.

ARSAS changes

• Add static DataSet completeness diagnostics: DataSet count, static members, mandatory inventory, represented count, unresolved primary leaf count, and explicit missing references.
• Include that block in the generated ARSAS diagnostic report for every IED.
• Add regression coverage through the actual SCL projection path using an Application/LLN0 DataSet targeting ADD/GGIO6.
• Verify the mandatory object-level member remains visible in Signal Selection inventory without [ST] suffix or fabricated .stVal.

This is intended to make the Siemens CID failure directly observable: a healthy import should show the full static inventory represented, and any gap now prints the missing DataSet/member reference.

[chatgpt-codex-connector]

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