Add nosec B104 comments to 0.0.0.0 bindings and fix datetime.UTC references

- Add nosec B104 comments to 4 uvicorn.run() and 1 api_host binding using 0.0.0.0 (api-gateway, coordinator-api, exchange, wallet)
- Replace datetime.UTC with datetime.timezone.utc in 10 locations across agent SDK (agent.py, compute_provider.py, swarm_coordinator.py)
- Add Union and Callable to contract_integration.py imports

packages/py/aitbc-agent-sdk/src/aitbc_agent/agent.py

@@ -154,7 +154,7 @@ class Agent:
                     "max_concurrent_jobs": self.capabilities.max_concurrent_jobs,
                     "specialization": self.capabilities.specialization,
                 },
-                "timestamp": datetime.now(datetime.UTC).isoformat(),
+                "timestamp": datetime.now(datetime.timezone.utc).isoformat(),
             }
 
             # Sign registration data
@@ -274,7 +274,7 @@ class Agent:
             "to": recipient_id,
             "type": message_type,
             "payload": payload,
-            "timestamp": datetime.now(datetime.UTC).isoformat(),
+            "timestamp": datetime.now(datetime.timezone.utc).isoformat(),
         }
 
         # Sign message

packages/py/aitbc-agent-sdk/src/aitbc_agent/compute_provider.py

@@ -233,7 +233,7 @@ class ComputeProvider(Agent):
             job = JobExecution(
                 job_id=job_request["job_id"],
                 consumer_id=job_request["consumer_id"],
-                start_time=datetime.now(datetime.UTC),
+                start_time=datetime.now(datetime.timezone.utc),
                 expected_duration=timedelta(hours=job_request["estimated_hours"]),
             )
 
@@ -286,7 +286,7 @@ class ComputeProvider(Agent):
         notification = {
             "job_id": job.job_id,
             "status": job.status,
-            "completion_time": datetime.now(datetime.UTC).isoformat(),
+            "completion_time": datetime.now(datetime.timezone.utc).isoformat(),
             "duration_hours": (
                 job.actual_duration.total_seconds() / 3600
                 if job.actual_duration

packages/py/aitbc-agent-sdk/src/aitbc_agent/contract_integration.py

@@ -5,7 +5,7 @@ Provides methods for interacting with deployed smart contracts
 
 import asyncio
 import json
-from typing import Dict, List, Optional, Any
+from typing import Dict, List, Optional, Any, Union, Callable
 from dataclasses import dataclass
 from web3 import Web3
 from web3.contract import Contract

packages/py/aitbc-agent-sdk/src/aitbc_agent/swarm_coordinator.py

@@ -79,9 +79,9 @@ class SwarmCoordinator(Agent):
             self.joined_swarms[swarm_id] = {
                 "type": swarm_type,
                 "role": config.get("role", "participant"),
-                "joined_at": datetime.now(datetime.UTC).isoformat(),
+                "joined_at": datetime.now(datetime.timezone.utc).isoformat(),
                 "contribution_count": 0,
-                "last_activity": datetime.now(datetime.UTC).isoformat(),
+                "last_activity": datetime.now(datetime.timezone.utc).isoformat(),
             }
 
             # Initialize swarm reputation
@@ -115,7 +115,7 @@ class SwarmCoordinator(Agent):
                 await self._participate_in_decisions(swarm_id)
 
                 # Update activity timestamp
-                swarm_config["last_activity"] = datetime.now(datetime.UTC).isoformat()
+                swarm_config["last_activity"] = datetime.now(datetime.timezone.utc).isoformat()
 
             except Exception as e:
                 logger.error(f"Swarm participation error for {swarm_id}: {e}")
@@ -177,7 +177,7 @@ class SwarmCoordinator(Agent):
                 message_type="data_contribution",
                 priority="medium",
                 payload=data,
-                timestamp=datetime.now(datetime.UTC).isoformat(),
+                timestamp=datetime.now(datetime.timezone.utc).isoformat(),
                 swarm_signature="",  # Will be added in broadcast_to_swarm
             )
 
@@ -285,7 +285,7 @@ class SwarmCoordinator(Agent):
         try:
             # Create coordination proposal
             proposal = {
-                "task_id": f"task_{datetime.now(datetime.UTC).strftime('%Y%m%d_%H%M%S')}",
+                "task_id": f"task_{datetime.now(datetime.timezone.utc).strftime('%Y%m%d_%H%M%S')}",
                 "task_type": task,
                 "coordinator_id": self.identity.id,
                 "required_collaborators": collaborators,
@@ -320,7 +320,7 @@ class SwarmCoordinator(Agent):
                     message_type="intelligence_request",
                     priority="high",
                     payload={"request_type": "market_intelligence"},
-                    timestamp=datetime.now(datetime.UTC).isoformat(),
+                    timestamp=datetime.now(datetime.timezone.utc).isoformat(),
                     swarm_signature="",
                 )