Default ENCODE_PRESET/CRF_SEASONS_FINAL in make-finals.sh

Older sky-cam.conf versions may not define these. Fall back to the
canonical defaults so make-finals.sh works without requiring the user
to update their local conf.

https://claude.ai/code/session_01C4jbd3waXG3eKZYbGUjLUQ

make-finals.sh

@@ -21,6 +21,8 @@ set -euo pipefail
 SCRIPT_DIR="$(dirname "$(realpath "$0")")"
 source "$SCRIPT_DIR/sky-cam.conf"
 export TIMEZONE
+ENCODE_PRESET="${ENCODE_PRESET:-slow}"
+CRF_SEASONS_FINAL="${CRF_SEASONS_FINAL:-26}"
 
 BACKUP_ROOT=""
 DRY_RUN=false