trace: declare Region event name fields as AnsiString (#1012)

RegionName and Category on Misc.RegionBeginWithId were declared as
uint8[] — a byte array with no Field_String class flag. UE Insights'
FEventData::GetString() explicitly requires Field_String and returns
false otherwise, so Insights analyzers that check(GetString(...)) fire
when reading zen traces.

Upstream UE declares these fields as WideString; zen's source strings
are std::string_view, so AnsiString is the natural fit and the wire
bytes are unchanged (same Field_8 aux stream — only the schema class
bit differs). Insights' FString GetString variant accepts either ANSI
or WIDE, so analyzers work without change.

Zen's own tourist-based analyzer in src/zen/trace/trace_model.cpp
reads raw aux bytes via Array<uint8[]> regardless of the schema tag,
and its DecodeRegionName already handles both 1-byte and 2-byte
widths, so it's unaffected.

0 files changed, 0 insertions, 0 deletions