Completes the mode-conflict admission surface deferred from the initial Stage 4:
- REJECT now delivers the reason to the client: punktfunk/1 closes the QUIC
connection with a distinct BUSY code (0x42) + the 'host busy: streaming WxH@Hz to
<client>' string, which the client reads from ApplicationClosed (validated on
loopback: the probe logs 'closed by peer: host busy … (code 66)').
- Windows default: separate (incl. the unconfigured default) resolves to JOIN — the
Windows native host admits a second client at the live mode instead of the old
silent last-wins reconfigure of the shared monitor (release-note behavior fix; the
reconfigure is now opt-in as steal). separate stays multi-view on Linux.
- GameStream 503: h_launch tracks the session owner fp (LaunchSession.owner_fp, kept
[u8;32] for Copy) and applies the policy when a DIFFERENT paired client launches —
reject → 503 (Moonlight 'host busy'), join → serve the live mode, steal/separate →
take over. Same-client re-launch is never a conflict.
Native reject-reason loopback-validated; Windows join-default pending .173 rebuild;
GameStream 503 pending a Moonlight client (can't drive /launch autonomously).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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