feat: add Parlant configurable log level

Read PARLANT_LOG_LEVEL env var to control Parlant server verbosity.
Defaults to INFO. Supports trace, debug, info, warning, error.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

trialpath/agent/setup.py

@@ -1,5 +1,8 @@
 """Parlant server and agent initialization."""
 
+import os
+
+from parlant.core.loggers import LogLevel
 from parlant.sdk import Agent, NLPServices, Server
 
 AGENT_NAME = "Patient Trial Copilot"
@@ -10,16 +13,28 @@ AGENT_DESCRIPTION = (
     "where additional data could unlock new trial options."
 )
 
+_LOG_LEVEL_MAP = {
+    "trace": LogLevel.TRACE,
+    "debug": LogLevel.DEBUG,
+    "info": LogLevel.INFO,
+    "warning": LogLevel.WARNING,
+    "error": LogLevel.ERROR,
+}
+
 
 async def create_server_and_agent(
     host: str = "0.0.0.0",
     port: int = 8800,
 ) -> tuple[Server, Agent]:
     """Create and start Parlant server with the TrialPath agent."""
+    log_level_str = os.environ.get("PARLANT_LOG_LEVEL", "info").lower()
+    log_level = _LOG_LEVEL_MAP.get(log_level_str, LogLevel.INFO)
+
     server = Server(
         nlp_service=NLPServices.gemini,
         host=host,
         port=port,
+        log_level=log_level,
     )
     await server.__aenter__()