hermes - 💡(How to fix) Fix Dashboard Chat stuck: /api/pty websocket handshake/connects but never streams frames [2 pull requests]

Summary

After updating Hermes from dashboard (now on v2026.5.7), Dashboard Chat no longer loads, while the rest of dashboard and gateway are healthy.

Environment

• Hermes version: v2026.5.7-26-gfaa13e49f-dirty
• Launch command: hermes dashboard --host 0.0.0.0 --port 9119 --no-open --insecure --tui
• Gateway running with API server on :8642
• Dashboard HTTP on :9119

What works

• GET /health returns 200
• Dashboard REST endpoints work with session token (/api/status returns 200)
• /api/ws websocket connects and emits gateway.ready
• CLI chat works (hermes chat -q ...)

What fails

• /api/pty websocket behavior is broken:
  • In one run it timed out during opening handshake.
  • After restart/retest, websocket connected, but no bytes/frames were ever emitted (waited 20s+), so chat tab remains stuck loading.

Repro steps

1. Start dashboard with embedded chat:
   • hermes dashboard --host 0.0.0.0 --port 9119 --no-open --insecure --tui
2. Open dashboard chat tab in browser.
3. Observe chat never becomes interactive.
4. Probe websocket transport:
   • /api/ws succeeds
   • /api/pty either hangs on handshake or connects but never sends data

Additional notes

• This appears isolated to the PTY stream path backing dashboard chat, not to gateway, auth token injection, or model/provider routing.
• There are existing related issues around dashboard chat/websocket behavior (#15915, #15731, #15972, #18415), but this specific signature is: /api/pty no frame emission after connect.