Removing one of the 3 AI-virus-protected files now starts a 60-second
window (tracked session-wide via LockedFilesRemovalDeadline). If the
other locked files aren't also removed before it expires, the virus
restores whichever ones were deleted and broadcasts a red warning to
the whole session, forcing players to coordinate the removal instead
of picking them off one at a time.
Also extends the Mercure broadcast payload with an optional 3rd
"messageType" element so pushed messages can render red (virus) or
green (mainframe) instead of always defaulting to green.
Frank
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