fix: always override context parameters in ContextInjector

Root cause: AI models were hallucinating signature/job_id/today_date values
and passing them in tool calls. The ContextInjector was checking
"if param not in request.args" before injecting, which failed when AI
provided (incorrect) values.

Fix: Always override context parameters, never trust AI-provided values.

Evidence from logs:
- ContextInjector had correct values (self.signature=gpt-5, job_id=6dabd9e6...)
- But AI was passing signature=None or hallucinated values like "fundamental-bot-v1"
- After injection, args showed the AI's (wrong) values, not the interceptor's

This ensures runtime context is ALWAYS injected regardless of what the AI sends.

Fixes #TBD

agent/base_agent/base_agent.py

@@ -232,17 +232,24 @@ class BaseAgent:
             context_injector: Configured ContextInjector instance with
                             correct signature, today_date, job_id, session_id
         """
+        print(f"[DEBUG] set_context() ENTRY: Received context_injector with signature={context_injector.signature}, date={context_injector.today_date}, job_id={context_injector.job_id}, session_id={context_injector.session_id}")
+
         self.context_injector = context_injector
+        print(f"[DEBUG] set_context(): Set self.context_injector, id={id(self.context_injector)}")
 
         # Recreate MCP client with the interceptor
         # Note: We need to recreate because MultiServerMCPClient doesn't have add_interceptor()
+        print(f"[DEBUG] set_context(): Creating new MCP client with interceptor, id={id(context_injector)}")
         self.client = MultiServerMCPClient(
             self.mcp_config,
             tool_interceptors=[context_injector]
         )
+        print(f"[DEBUG] set_context(): MCP client created")
 
         # CRITICAL: Reload tools from new client so they use the interceptor
+        print(f"[DEBUG] set_context(): Reloading tools...")
         self.tools = await self.client.get_tools()
+        print(f"[DEBUG] set_context(): Tools reloaded, count={len(self.tools)}")
 
         print(f"✅ Context injected: signature={context_injector.signature}, "
               f"date={context_injector.today_date}, job_id={context_injector.job_id}, "

agent/context_injector.py

@@ -49,14 +49,16 @@ class ContextInjector:
         """
         # Inject context parameters for trade tools
         if request.name in ["buy", "sell"]:
-            # Add signature and today_date to args if not present
-            if "signature" not in request.args:
-                request.args["signature"] = self.signature
-            if "today_date" not in request.args:
-                request.args["today_date"] = self.today_date
-            if "job_id" not in request.args and self.job_id:
+            # Debug: Log self attributes BEFORE injection
+            print(f"[ContextInjector.__call__] ENTRY: id={id(self)}, self.signature={self.signature}, self.today_date={self.today_date}, self.job_id={self.job_id}, self.session_id={self.session_id}")
+            print(f"[ContextInjector.__call__] Args BEFORE injection: {request.args}")
+
+            # ALWAYS inject/override context parameters (don't trust AI-provided values)
+            request.args["signature"] = self.signature
+            request.args["today_date"] = self.today_date
+            if self.job_id:
                 request.args["job_id"] = self.job_id
-            if "session_id" not in request.args and self.session_id:
+            if self.session_id:
                 request.args["session_id"] = self.session_id
 
             # Debug logging

api/model_day_executor.py

@@ -140,7 +140,10 @@ class ModelDayExecutor:
                 job_id=self.job_id,
                 session_id=session_id
             )
+            logger.info(f"[DEBUG] ModelDayExecutor: Created ContextInjector with signature={self.model_sig}, date={self.date}, job_id={self.job_id}, session_id={session_id}")
+            logger.info(f"[DEBUG] ModelDayExecutor: Calling await agent.set_context()")
             await agent.set_context(context_injector)
+            logger.info(f"[DEBUG] ModelDayExecutor: set_context() completed")
 
             # Run trading session
             logger.info(f"Running trading session for {self.model_sig} on {self.date}")