Every boot path constructs SigmaStudioTcpServer as a named local,
start()s it, then moves it into NetBootstrap. The moved-from local's
own destructor still runs stop() right after, which used to do an
unconditional activeListenFd().store(-1) -- clobbering the singleton
the moved-to (real, running) instance had just inherited. From then on
acceptLoopTask() called accept(-1, ...) == EBADF forever, on every
single boot, breaking every SigmaStudio Remote Connection attempt.
stop() now only clears the singleton via compare-exchange against its
own listenFd_, so a moved-from husk with no fd of its own leaves the
real instance's registration alone. Keeps a recreateListenSocket()
self-heal in acceptLoopTask() as a safety net for EBADF from any other
future cause, though it's no longer expected to fire in normal
operation.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
micheleandClaude Sonnet 5
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