refactor: improve error handling and remove hardcoded credentials

- Changed bare except clauses to specific exception types in web3_utils.py, testing.py, messages.py, and message_storage.py
- Replaced print() calls with logger in testing.py, agent_discovery.py, compliance_agent.py, coordinator.py, trading_agent.py, keys.py, escrow.py, persistent_spending_tracker.py, sync_cli.py, and client.py
- Added logger initialization using get_logger(__name__) in compliance_agent.py, coordinator.py, trading_agent.py, keys.py, escrow.py, persistent_spending_tracker.py, and client.py
- Removed hardcoded secret

cli/utils/secure_audit.py

@@ -233,7 +233,7 @@ class SecureAuditLogger:
             try:
                 hour = entry["timestamp"][:13]  # YYYY-MM-DDTHH
                 hourly_counts[hour] = hourly_counts.get(hour, 0) + 1
-            except:
+            except (KeyError, TypeError):
                 pass
         
         # Create report