TransportSocket object has no attribute 'send'

[deacon-mp]

Describe the bug
When deploying the Manx agent (Windows and Linux), the agent will connect to the C2 and after a while it will show dead although it is still beaconing out.
When running Caldera with Debug I receive a transport error. Tested with ragdoll and sandcat agents and those remained "alive."

To Reproduce
Steps to reproduce the behavior:

1. Start the caldera server (python3 server.py --insecure -l DEBUG)
2. Deploy Manx agent

Expected behavior
Agent remains alive and trusted while beaconing.

Screenshots

Desktop (please complete the following information):

• OS: [e.g. Mac, Windows, Kali] Kali Linux
• Browser [e.g. chrome, safari] Chrome
• Version [e.g. 2.8.0] 5.0.0

Additional context
Add any other context about the problem here.

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Migrated from mitre/caldera#3049

[deacon-mp]

Triage note: This bug is caused by the deprecated Python 3 TransportSocket send/receive API. PR #42 (bleepbop/VIRTS-4793/fix-manx-deprecated-socket) is already open and addresses this by introducing a new Connection object using asyncio read/write streams instead of direct socket usage. Please review and merge PR #42 to resolve this issue.

[deacon-mp]

Fixed in #55 — adds a Connection wrapper class for the modern asyncio StreamReader/StreamWriter API (replacing removed TransportSocket.send/recv) and updates the aiohttp WebSocket calls in h_terminal.py.