PRD 0018 chunk 5. The dashboard's operator-edit verbs
(`routes edit`, `pipelock edit`) enumerated running sidecars
via `docker ps --filter name=...` prefix scans. Switch to
`docker compose ls`-based discovery so the dashboard, cleanup
CLI, and launch step all agree on what's running.
Mechanics:
- `claude_bottle/backend/docker/compose.py` grows three shared
helpers: `list_compose_projects` (the JSON parse moved out
of cleanup), `slug_from_compose_project` (inverse of
`compose_project_name`), and `list_active_slugs` (sugar over
the first two for the common "what's running?" question).
- cleanup.py drops its private `_list_compose_projects` +
`_PROJECT_PREFIX` in favor of the shared ones; `list_active`
simplifies (one compose-ls call, not two).
- dashboard.py's `_discover_sidecar_slugs` becomes
`_discover_active_with_service`: cross-references the active
slug list with a label-filtered `docker ps` so only bottles
whose given service container is actually up surface in the
edit menu. Bottles without an egress sidecar (no
bottle.egress.routes) no longer appear for `routes edit`.
3 new unit tests cover the slug ↔ compose-project naming
contract; manual probe with a fake compose project confirms
both `discover_egress_slugs` and `discover_pipelock_slugs`
return the expected slug.
didericis
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