Fix Event Log value when legacy report sends CDC struct

[masarray]

Problem

Field Event Log export shows a raw IEC 61850 CDC structure in Value, e.g.:

Structure(3) {stVal=false, q=Quality{...}, t=BinaryTime(...)}

while the monitored signal / IEC telegram is the Boolean ...stVal leaf and PreviousValue is already scalar (False). This produces transitions such as False → Structure(...).

Root cause

ARSAS currently pins an ARIEC61850 engine commit where generic SPS-style status DataObjects can still arrive through the report path as a rendered structure. The Event Log records the formatted display value, so the raw structure leaks into the CSV.

Fix

• Add a narrow compatibility normalization in Iec61850ValueFormatter for legacy values whose first named structure field is exactly Boolean stVal=true|false.
• Normalize those values to the existing Boolean display (True / False).
• Leave non-stVal structures untouched, avoiding accidental collapse of measurement structures.

Regression coverage

Tests use the same Structure(3) {stVal=false, ...} payload observed in the supplied ARSAS Events CSV, cover both False and True, and verify a {mag=...} structure remains unchanged.

The corresponding source fix is in ARIEC61850 PR #79. This ARSAS guard is intentionally retained for compatibility with older/pinned engine builds.

[chatgpt-codex-connector]

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