refactor: move standalone scripts to scripts/ directory

Move batch_runner, trajectory_compressor, mini_swe_runner, and rl_cli
from the project root into scripts/, update all imports, logger names,
pyproject.toml, and downstream test references.

datagen-config-examples/run_browser_tasks.sh

@@ -29,7 +29,7 @@ echo "📝 Logging to: $LOG_FILE"
 # Point to the example dataset in this directory
 SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 
-python batch_runner.py \
+python scripts/batch_runner.py \
   --dataset_file="$SCRIPT_DIR/example_browser_tasks.jsonl" \
   --batch_size=5 \
   --run_name="browser_tasks_example" \

datagen-config-examples/web_research.yaml

@@ -4,7 +4,7 @@
 # Generates tool-calling trajectories for multi-step web research tasks.
 #
 # Usage:
-#   python batch_runner.py \
+#   python scripts/batch_runner.py \
 #     --config datagen-config-examples/web_research.yaml \
 #     --run_name web_research_v1