refactor: use get_settings().log_level instead of hardcoded env var

Address PR review feedback to use the settings infrastructure instead of
directly accessing environment variables. This approach:
- Keeps the env var name defined in one place (PluginsSettings model)
- Gets .env file support for free
- Stays consistent with how other settings are read in the codebase

Changes:
- grpc/server/runtime.py: Use get_settings().log_level with fallback to args
- mcp/server/runtime.py: Use get_settings().log_level
- unix/server/runtime.py: Use get_settings().log_level

Author: Bogdan-Marius-Catanus

cpex/framework/external/grpc/server/runtime.py

@@ -290,8 +290,9 @@ def main() -> None:
     args = parser.parse_args()
 
     # Configure logging - respect PLUGINS_LOG_LEVEL environment variable
-    log_level_str = os.getenv("PLUGINS_LOG_LEVEL", args.log_level).upper()
-    log_level = getattr(logging, log_level_str, logging.INFO)
+    settings = get_settings()
+    log_level_str = settings.log_level or args.log_level
+    log_level = getattr(logging, log_level_str.upper(), logging.INFO)
     logging.basicConfig(
         level=log_level,
         format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",

cpex/framework/external/mcp/server/runtime.py

@@ -79,11 +79,13 @@
     MCP_SERVER_INSTRUCTIONS,
     MCP_SERVER_NAME,
 )
-from cpex.framework.settings import get_transport_settings
 
 # Configure logging - respect PLUGINS_LOG_LEVEL environment variable
-log_level_str = os.getenv("PLUGINS_LOG_LEVEL", "INFO").upper()
-log_level = getattr(logging, log_level_str, logging.INFO)
+from cpex.framework.settings import get_settings, get_transport_settings
+
+settings = get_settings()
+log_level_str = settings.log_level
+log_level = getattr(logging, log_level_str.upper(), logging.INFO)
 logging.basicConfig(
     level=log_level,
     format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",

cpex/framework/external/unix/server/runtime.py

@@ -34,8 +34,9 @@
 from cpex.framework.settings import get_settings
 
 # Configure logging - respect PLUGINS_LOG_LEVEL environment variable
-log_level_str = os.getenv("PLUGINS_LOG_LEVEL", "INFO").upper()
-log_level = getattr(logging, log_level_str, logging.INFO)
+settings = get_settings()
+log_level_str = settings.log_level
+log_level = getattr(logging, log_level_str.upper(), logging.INFO)
 logging.basicConfig(
     level=log_level,
     format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",