connectors/mcp-tunnels/troubleshooting

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# Troubleshoot MCP tunnels
## Connection
### The tunnel stack starts but cloudflared never connects
### cloudflared logs `failed to sufficiently increase receive buffer size`
### The setup component fails with an authentication or permission error
### Setup fails with `Organization already has the maximum of 10 non-archived Tunnels`
### Helm install fails with a hook error
### A tunnel hostname does not respond to curl or a browser
## Routes and certificates
### Proxy logs `no route for host`
### Proxy logs `IP validation failed`
### Proxy exits with `cannot unmarshal !!seq into map[string]string`