The per-frame configstring path in SVD_ReadFrame was not filtering
dangerous configstrings like SVD_ApplyConfigstrings does. When a
recorded map_restart changed CS_SERVERINFO (containing maxclients),
applying it overwrote maxclients=64 with the recorded value,
triggering a latched restart loop.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>