Set svdemo_autorecord 1 to automatically record a demo on every
map load. Demo files are named <mapname>_YYYYMMDD_HHMMSS.svdm
in the svdemos/ directory.
Refactored SVD_Record_f to use SVD_StartRecording helper so both
manual and auto recording share the same code path. Also fixed
prevPlayers delta state not being cleared on recording start.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>