Default docker scheduler delay to zero

Set docker/run_tests.py --scheduler-delay-ms default to 0 to match
observed local behavior where immediate scheduling is sufficient.

Keep the option so callers can raise the delay explicitly if needed.

Author: kaste

README.md

@@ -144,7 +144,7 @@ Useful options:
 - `--failfast`
 - `--docker-image <name>`
 - `--no-cache-volume`
-- `--scheduler-delay-ms 300` (lower can be faster)
+- `--scheduler-delay-ms 0` (default)
 
 > [!TIP]
 >

docker/run_tests.py

@@ -125,8 +125,8 @@ def parse_args(argv: list[str] | None) -> argparse.Namespace:
     parser.add_argument(
         "--scheduler-delay-ms",
         type=int,
-        default=300,
-        help="Delay before running scheduled tests inside Sublime (default: 300).",
+        default=0,
+        help="Delay before running scheduled tests inside Sublime (default: 0).",
     )
     parser.add_argument(
         "--pull",