Summary

Add a --call-id flag to azd ai agent invoke that sends the value as the x-agent-foundry-call-id header when invoking a locally running agent. The header is intentionally local-only and is never forwarded on remote Foundry requests.

Details

• Add AgentFoundryCallIDHeader constant in agent_api/operations.go
• Add --call-id flag to invoke, threaded through invokeFlags
• Implement applyLocalCallIDHeader helper that sets the header on local paths (responsesLocal, invocationsLocal) only
• Update help text and CHANGELOG to document the local-only scope
• Add tests verifying the header is present when --call-id is set and absent when omitted