Updates the Docker Backend section of the user-guide configuration page
to match the actual behavior shipped in PR #33645. Pre-PR the docs
claimed "container is stopped and removed on shutdown," which was
never quite true for the documented happy path and is now actively
wrong: in default mode the container survives across Hermes processes
so background processes (npm watchers, dev servers, long-running
pytest) carry over the way the "ONE long-lived container shared
across sessions" promise requires.
Changes to `website/docs/user-guide/configuration.md`:
* Reworked the intro paragraph at the top of the Docker Backend
section to describe the actual cross-process reuse contract.
* Expanded the YAML example with the new keys
`docker_persist_across_processes` and `docker_orphan_reaper`, plus
the pre-existing-but-undocumented `docker_env`, `timeout`, and
`lifetime_seconds`. Clarified the `container_persistent` comment
to disambiguate from `docker_persist_across_processes`.
* Added a `docker_env` vs `docker_forward_env` explainer (one
injects literal KEY=value, the other forwards values from the
host/.env — easy to confuse).
* Replaced the one-line "Container lifecycle" paragraph with a full
subsection covering:
- the three labels Hermes tags every container with
(hermes-agent, hermes-task-id, hermes-profile)
- the label-probe reuse mechanism on startup
- a teardown-trigger table with four rows for every situation
that destroys the container in default mode
- edge cases (OOM kill, profile switching)
* Added an "Environment variable overrides" table covering all
TERMINAL_* env vars relevant to the Docker backend, including the
previously-undocumented `TERMINAL_DOCKER_ENV` and
`HERMES_DOCKER_BINARY`.
Changes to `website/docs/user-guide/docker.md`:
* Extended the cross-link admonition (around l.227) so the
Hermes-in-Docker page points at the new terminal-backend keys
(`docker_env`, `docker_persist_across_processes`,
`docker_orphan_reaper`) alongside the ones already mentioned.
No code changes. Behavior already covered by tests added in earlier
commits on this branch (#33645 commits 1-5).
Refs #20561
3c6e70aef1