Add Windows event identifiers, designations, and error codes

[0x0bug]

Summary

Improves the Event Log report so Windows errors are easier to identify without reading only raw messages.

Each displayed event group now includes:

• a stable Provider/Event ID identifier;
• a concise human-readable designation;
• hexadecimal error codes such as HRESULT/NTSTATUS values when they are present in the event text.

Known high-signal events reuse their documented WDT designation. Generic events derive the designation from the event's own message instead of inventing a diagnosis.

Safety

This is presentation/context only. Generic Event Log errors still do not automatically become WDT findings, so the existing conservative classification model is unchanged.

Tests

Adds coverage for code extraction, deduplication, designation generation, stable event identifiers, and rendered output.