The call-timeout test asserted the real 10 s Dispatch floor, adding 10 s+
to every suite run. Add a cfg(test)-only OCS_PLUGIN_TEST_FLOOR_SECS seam
so the test fires at its 1 s base instead; production still enforces the
hard safety floors. Test now finishes in ~1 s.
Also document in mark_dead that the host-side socket is closed indirectly
by killing the child (which unblocks and drops the detached reader
thread's Stream), not by the take() in mark_dead itself.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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