[Copilot]

With -StreamingHost $Host, Receive-Job -Wait -Verbose or -Debug can repeatedly replay a single message, generating excessive logs.

• Host isolation: Supply the streaming host through PSInvocationSettings.Host for initialization and main scripts rather than sharing the caller’s internal host with another runspace.
• Stream routing: Avoid buffering host-streamed verbose, debug, warning, and progress records for replay. Preserve success output, errors, and information records—including silent information.
• Coverage and help: Add regression coverage for single-message delivery and retained records; document buffering behavior.

Start-ThreadJob -StreamingHost $Host {
    Write-Verbose 'yo' -Verbose
    Start-Sleep -Seconds 2
} | Receive-Job -Wait -Verbose
# VERBOSE: yo — once

• Fixes Duplicated Verbose Messages on StreamingHost of Receive-Job with Wait and Verbose flags present #70