Allow passing additional positional CLI args to the agent CLI used for the run

[nezhar]

Summary

Currently, users may not be able to provide extra positional arguments to the agent CLI when initiating a run. This feature request is to enable passing additional positional CLI arguments, increasing flexibility for custom workflows.

Expected Behavior

• Users can specify extra positional arguments when running the agent CLI.
• These arguments should be forwarded to the agent process as-is.
• There should be no breaking change for current usage (current functionality remains unaffected for users not passing extra args).

Motivation

Certain workflows and integrations require the ability to provide arbitrary extra commands or flags to the agent at runtime. Supporting this enables advanced customization without manual intervention.

Acceptance Criteria

• Extra positional CLI arguments are recognized and passed correctly.
• No disruption to existing users who do not supply additional arguments.
• Documentation and help messages are updated as needed.

Additional Context

• This is especially useful for advanced automation or deployments where agent needs specific runtime instructions.