Fix the documented WebSocket limitation in Docker live mode

## Context

The scripts reference (docs/SCRIPTS.md) documents that live trading through `scripts/run-docker.sh` has a known WebSocket config limitation, while native execution connects fine. The comparison table steers users to native for live trading because of it. A production-oriented Docker path that cannot do live trading undercuts the "recommended for production" positioning.

## What to do

- Reproduce the failure: run `scripts/run-docker.sh -m live -v` with valid credentials and capture the WebSocket error.
- Identify the root cause. Likely suspects: CA certificates missing in the runtime image for TLS to the exchange, container networking/DNS, or the config volume mount not exposing what live mode needs.
- Fix the Dockerfile or script accordingly, and verify a live Coinbase connection from inside the container.
- Update docs/SCRIPTS.md to remove the limitation once fixed.

## Notes

If the root cause turns out to be environmental and not fixable in the image, document the exact constraint and workaround instead.

Start by running scripts/run-docker.sh -m live -v with valid credentials and capture the WebSocket error. Inspect the Dockerfile and run-docker.sh for runtime certificates, networking or DNS, and configuration mounts. Verify a live Coinbase connection from inside the container, then update docs/SCRIPTS.md to remove the limitation or record the confirmed constraint and workaround.

Written by the indexing model from the issue text.