feat(wire): route_to_call trace flag + child_execution_id + trace_events; route_to_set_attributes trace (additive proto + mapper)
Flow Debugger (design 2026-09-05 §5.2/§5.4): site_command.proto gains trace=7 on RouteToCallRequestDto, child_execution_id=6 + repeated sitestream.AuditEventDto trace_events=7 on RouteToCallResponseDto, trace=6 on RouteToSetAttributesRequestDto (imports Protos/sitestream.proto the way central_control.proto does). Mapper round-trips them; an empty trace_events list maps to null so an untraced/older site reads as 'not traced'. Vendored C# regenerated via docker/regen-proto.sh (csproj untouched); golden samples extended. Claude-Session: https://claude.ai/code/session_01GSLkkHKz9JrAtmJjmQK3cP
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