fix: canonicalize cross-LD SCL DataSet member references

[masarray]

Problem

SCL parser keeps a human/display FCDA reference such as AA1C1F13R4/ADD/GGIO6.CBOpnd [ST], while the live model uses canonical object identity AA1C1F13R4ADD/GGIO6.CBOpnd. This prevents static DataSet members from matching cross-LDevice DataObjects in downstream signal inventory.

Fix

• Canonicalize SCL DataSet member references at the live-model projection boundary.
• Keep FC separately instead of appending [ST]/[MX] to the reference.
• Preserve object-level FCD members exactly; do not invent .stVal.
• Add regression coverage for a DataSet owned by Application/LLN0 that points to ADD/GGIO6.

This targets the real Siemens CID shape used by ARSAS Signal Selection.

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