Fix real-device IO FAT discovery and Siemens hierarchy binding

[masarray]

Field failure

On AA1C1F13R4 (192.168.81.17), MMS association/discovery succeeds but IO FAT preflight reports all 30 imported signals as missing, including UCC-IEC-0698…0701 (ADD/GGIO1.*).

Root causes addressed

1. ARIEC61850 Harden and simplify the ARSAS product website #54 fixes MMS GetNameList pagination when production IEDs omit the optional moreFollows field (DEFAULT TRUE).
2. ARSAS supplemental discovery now preserves names already read successfully if later VAA/type-tree expansion times out, instead of throwing away the completed directory inventory.
3. Siemens/DIGSI engineering exports may render an LN prefix as a folder (ADD/GGIO1, VI3p1_OperationalValues/RPRE_MMXU1) while live MMS/SCL exposes the same LN as a concatenated prefix (ADDGGIO1, VI3p1_OperationalValuesRPRE_MMXU1). FAT binding recognizes the deterministic equivalent only when the imported folder terminates at the exact workbook LN metadata boundary.

Safety

• Exact reference matching remains first priority.
• Hierarchy normalization is not fuzzy matching.
• Only imported references may be hierarchy-collapsed; observed/live MMS references are never collapsed.
• The final folder segment must exactly equal the imported workbook Logical Node before collapse is permitted.
• A normalized candidate is accepted only when exactly one non-control signal matches.
• Cross-boundary singleton collisions such as AB/GGIO1 versus A/BGGIO1 remain missing/blocked instead of being accepted.
• The existing FAT safety gate is unchanged.

Regression coverage

• AA1C1F13R4 / 192.168.81.17 synthetic field case for UCC-IEC-0698, 0699, 0700 and 0701.
• Siemens operational-values hierarchy normalization using verified RPRE_MMXU1 metadata.
• Cross-boundary singleton collision rejection.
• Live-binding normalization after acquisition starts.
• Importer verified to populate IoTestPointPlan.LogicalNode from the workbook LN column.

Engine

Pinned to merged ARIEC61850 commit 902fc828dcf976a705dc73b88f1e9c42e5bf6a93 from PR #54.

Validation

Latest head 779f54c200f7ea8fc433a3eec0f699edfcfafff8:

• Validate IO List Testing Synchronize IO List FAT documentation and landing pages #116 — SUCCESS
• Build ARSAS #931 — SUCCESS, including full application regressions, portable single-EXE publish and smoke test
• Validate SV evidence bundles Release ARSAS 1.6.24: multi-IED FAT and SIPROTEC Clock Sync #149 — SUCCESS
• Validate ARSAS Windows installer Port ARIEC native report preview and polish IO FAT table #125 — SUCCESS, including silent install/uninstall smoke test
• Automated P1 review about generic slash collapse was addressed by restricting normalization to the verified imported LN boundary; thread resolved.

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