[Feature]: Complete ACP Support for Llama-index in Agent Workflow Server

[aduminuc]

Problem Statement

Agent Workflow server should support the following functionalities of ACP for Llama-index:

Thread Runs
Interrupts
Callbacks

Proposed Solution

Agent Workflow Server Langgraph adapter should be extended to support the above functionalities.

Alternatives Considered

No response

Additional Context

No response

Checklist

• I have read the contributing guidelines
• I have verified this does not duplicate an existing feature request