debug: add self attribute logging to ContextInjector.__call__

Log ContextInjector instance ID and attribute values at entry to __call__()
to diagnose why attributes appear as None during tool invocation despite
being set correctly during set_context().

This will reveal whether:
- Multiple ContextInjector instances exist
- Attributes are being overwritten/cleared
- Wrong instance is being invoked

agent/context_injector.py

@@ -49,6 +49,9 @@ class ContextInjector:
         """
         # Inject context parameters for trade tools
         if request.name in ["buy", "sell"]:
+            # 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}")
+
             # Add signature and today_date to args if not present
             if "signature" not in request.args:
                 request.args["signature"] = self.signature