fix: route logging to stdout and simplify INFO format

- Route all DataJoint logs to stdout instead of stderr
  (avoids red highlighting in terminals/IDEs that color stderr)
- Simplify INFO/DEBUG format: remove level tag for cleaner output
- Keep [WARNING] and [ERROR] tags for actual issues

Before:
  [2026-01-27 10:30:45,123][INFO]: DataJoint 2.0.0 connected to...

After:
  [2026-01-27 10:30:45] DataJoint 2.0.0 connected to...
  [2026-01-27 10:31:02][WARNING]: Table xyz not found

Users needing stderr can configure their own handlers.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: dimitri-yatsenko

src/datajoint/logging.py

@@ -6,10 +6,22 @@
 
 log_level = os.getenv("DJ_LOG_LEVEL", "info").upper()
 
-log_format = logging.Formatter("[%(asctime)s][%(levelname)s]: %(message)s")
 
-stream_handler = logging.StreamHandler()  # default handler
-stream_handler.setFormatter(log_format)
+class LevelAwareFormatter(logging.Formatter):
+    """Format INFO messages cleanly, show level for warnings/errors."""
+
+    def format(self, record):
+        timestamp = self.formatTime(record, "%Y-%m-%d %H:%M:%S")
+        if record.levelno >= logging.WARNING:
+            return f"[{timestamp}][{record.levelname}]: {record.getMessage()}"
+        else:
+            return f"[{timestamp}] {record.getMessage()}"
+
+
+# Use stdout for all logging (avoids red highlighting in terminals/IDEs)
+# Users needing stderr can configure their own handlers
+stream_handler = logging.StreamHandler(sys.stdout)
+stream_handler.setFormatter(LevelAwareFormatter())
 
 logger.setLevel(level=log_level)
 logger.handlers = [stream_handler]