fix --filter to accept multiple space-separated tokens

    parser.add_argument(

        "--filter",

        type=str,

        nargs="+",

        default=None,

        metavar="TOKEN",

        help=(

            "Filter tests. Supports levels LEVEL1 LEVEL2 LEVEL3 and tags ENC DEC REND ISAR ISAR_ENC "

            "(comma/space-separated), decoder formats EXT MONO STEREO, "

            "and case-insensitive command substring filtering. Plain terms are restrictive (AND). "

            "Use +TERM to add matches and -TERM to remove matches. "

            "LEVEL3 is default. LEVEL2 is currently unsupported."

            "Select which tests to run. Accepts any combination of the following tokens: "

            "(1) Level: LEVEL1, LEVEL3 (default: LEVEL3 = no restrictions). "

            "LEVEL1 restricts ENC to <=80 kbps and DEC to EXT<=80 kbps, MONO and STEREO outputs. "

            "(2) Tag: ENC, DEC, REND, ISAR, ISAR_ENC — selects specific test groups. "

            "Under LEVEL1, +REND or +ISAR adds those groups to the default ENC+DEC set. "

            "(3) Decoder format (LEVEL1 DEC only): EXT, MONO, STEREO — further restricts which "

            "output formats are included within the already-restricted LEVEL1 DEC set. "

            "(4) Substring: any other plain token is matched case-insensitively against the test "

            "command line. Multiple plain tokens are combined with logical AND. "

            "Prefix a token with + to add matching tests to the selection, "

            "or with - to remove matching tests from the selection. "

            "Examples: "

            "'--filter LEVEL1' — run LEVEL1 ENC+DEC; "

            "'--filter LEVEL1 DEC MONO' — run only MONO tests from the LEVEL1 DEC set; "

            "'--filter LEVEL1 +REND' — run LEVEL1 ENC+DEC and also all REND tests; "

            "'--filter DEC JBM' — run DEC tests containing 'JBM'; "

            "'--filter DEC +BINAURAL' — run all DEC tests plus those containing 'BINAURAL'; "

            "'--filter DEC -voip' — run all DEC tests except those containing 'voip'."

        ),

    )

    parser.add_argument(

        validate_build_binaries(parser, args.cut_build_path, "CUT")

    # Parse --filter into level + optional tag selection + optional format/substring filters.

    raw_filter = args.filter or ""

    raw_filter = " ".join(args.filter) if args.filter else ""

    filter_tokens = [tok for tok in re.split(r"[\s,]+", raw_filter.strip()) if tok]

    valid_tags = set(IVAS_Bins.keys())