M2D-1: typed IEC 61850 Quality and TimeQuality in native Workbench

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Baseline

Based on integrated M2C (main d437443). Native Qt Workbench only; no firmware, SMV/PTP, MMS transport or ReportControl lifecycle changes.

Engineering value

• Decode genuine 13-bit IEC 61850 Quality from successful MMS bit-string values: validity (good/invalid/reserved/questionable), overflow, out-of-range, bad-reference, oscillatory, failure, old-data, inconsistent, inaccurate, source, test, operator-blocked.
• Decode genuine IEC 61850 UTC time + TimeQuality from typed MMS utc_time: UTC milliseconds, LeapSecondsKnown, ClockFailure, ClockNotSynchronized and 5-bit accuracy code; 31 reported as unspecified.
• Decode only q or t typed leaf results. Malformed quality and wrong data kind fail closed, never synthesize false flags from absent MMS reads or offline SCL.
• Store decoded metadata sparsely against canonical node indices, not 60k eager QVariantMaps. Clear metadata on new model. Both private client and shared Browser context models receive the same generation-checked evidence at MMS Read completion.
• Expand metadata in Browser Data Model leaf inspector and use corresponding summaries for DA rows in DataSets. No network action on expansion.
• Add C++ regression for quality bits, invalid shape, UTC quality, typed siblings, and model replacement; QML contract lock.

Acceptance

Native Qt build, QML smoke, Browser contract and large-model regression all pass at exact head; verify Windows screenshot/manual live IED before declaring full IEDScout parity.

Scope limits

This is M2D-1: typed MMS Read evidence in Data Model and DataSets. Report payload decoding and nested per-report Quality/TimeQuality presentation remain separate follow-up work. No merge until CI green and source review.

CI efficiency

Single cohesive feature commit. Only relevant Qt/SCL-assisted workflows, no blanket firmware CI and no release installer until acceptance.