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etc.md

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-there is no overview about participants that will read the walkthrough doc like the following? I need it so that when participants check this doc, they will know who are included
-this info should be just under the doc's purpose statement
 
 
-System Participants Overview
 
-| Participant | Section | Role | What It Shows |
-|-------------|---------|------|---------------|
-| **Frontend Application** (Customer UI) | Participant A | Primary user-facing client that initiates sessions and exchanges messages with the agent | End-to-end journey: register → send message → receive response → handle termination |
-| **Agent Instance** (yiemAgent Process) | Participant B | Per-session Julia task that manages conversation, calls LLM via load balancer, and executes MCP tools | Lifecycle: spawn → chat loop → tool calls → response enrichment → terminate |
-| **Session Manager** (Main Service Loop) | Participant C | Central coordinator that manages session lifecycle, enforces timeouts, and dispatches messages | Operations: startup → warmup → registration routing → timeout polling → message dispatch |
-| **External Services** (MCP, SLB, Object Storage) | Participant D | Backing services for LLM routing, tool execution, and file transfer | Integration: LLM request flow → MCP tool/list and tool/call → S3 upload/download |
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