Error starting agents

Im currently trying out self-hosting buzz. Followed the Quick Start, followed the Testing guide.
The relay is hosting fine as far as im concerned, but the agents are not starting.
May I know what i could be missing?
Agent setup:

Logs:
```
=== starting Fizz (a8f2da393a8b0e03a848b9b55e73e5adfb5397d625aadfb206f3b47df9d607b1) at 2026-08-11T03:01:56.153456776+00:00 ===
2026-08-11T03:01:56.178680Z INFO buzz_acp: buzz-acp starting: relay=ws://127.0.0.1:3000 pubkey=$PUBKEY agent_cmd=/path/to/buzz/desktop/src-tauri/../../target/debug/buzz-agent mcp_cmd=/path/to/buzz/desktop/src-tauri/../../target/debug/buzz-dev-mcp idle_timeout=900s max_turn=7200s agents=10 heartbeat=0s subscribe=Mentions dedup=Queue meh=Steer ignore_self=true context_limit=12 max_turns_per_session=0 presence=true typing=true memory=true model=auto permission_mode=bypassPermissions respond_to=owner-only
2026-08-11T03:01:56.187157Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.188006Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=0
2026-08-11T03:01:56.193663Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.194077Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=1
2026-08-11T03:01:56.198604Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.199182Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=2
2026-08-11T03:01:56.203929Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.204377Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=3
2026-08-11T03:01:56.209001Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.209425Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=4
2026-08-11T03:01:56.214979Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.215603Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=5
2026-08-11T03:01:56.220899Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.221436Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=6
2026-08-11T03:01:56.226169Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.226611Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=7
2026-08-11T03:01:56.232002Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.232554Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=8
2026-08-11T03:01:56.236875Z ERROR buzz_agent: config: BUZZ_AGENT_PROVIDER=relay-mesh not supported
2026-08-11T03:01:56.237424Z ERROR buzz_acp: agent initialize failed: Agent process exited unexpectedly agent=9
Error: all 10 agents failed to start — cannot continue
```

Start with the Quick Start and Testing guide, then reproduce the failure using the shown buzz-acp command and logs. Read the buzz-agent configuration handling for BUZZ_AGENT_PROVIDER and trace the relay-mesh error; done means the configured agents initialize successfully or the supported setup is clearly identified.

Written by the indexing model from the issue text.