Adds a digest-pinned headless-shell Chrome DevTools Protocol daemon as a
boot-persistent quadlet unit (chrome-devtools-protocol.container). The
entrypoint override drops the image's socat front so the CDP endpoint binds
loopback-only on 127.0.0.1:9222 in the host network namespace; only the two
host-network consumers (Signal gateway, webui server) can drive it.
hermes-webui flips Network=dankclaw_default -> Network=host so its agent
process shares the daemon's namespace (0.0.0.0:8787 bind is LAN-facing as
before; no exposure change). deploy_hermes installs the new unit and starts
it if inactive without restarting in-flight browser sessions.
