deploy_topology was flipping to ACTIVE the moment 'compose up -d'
returned 0, but compose returns 0 as soon as containers are *started*.
A service that crashes on boot (port bind failure, bad image, missing
entrypoint) left the topology row sitting at ACTIVE indefinitely while
half the substrate was dead.
After compose returns, we now run 'compose ps --all --format json',
parse the newline-delimited per-container rows, and downgrade to
DEGRADED with a reason listing the first eight unhealthy containers if
anything isn't in state='running'. Operators see real state on the
topology page instead of an optimistic flag.
_compose_ps swallows compose-level errors (returns []) so an unrelated
docker hiccup doesn't gate the success path — the existing in-flight
exception path still catches genuine deploy failures with FAILED.
decnet.engine.services_live exposes add_service / remove_service for
both fleet and topology decky scopes. The host's _compose() wrapper
already supported per-service targeting (up --no-deps -d <svc>,
stop, rm -f); what was missing was the orchestration around it:
* add: validate against decnet.services.registry (rejects unknown +
fleet_singleton); persist the new services list; re-render the
per-scope compose file (so future redeploys reflect the change);
run docker compose up -d --no-deps --build <decky>-<svc>.
* remove: stop + rm -f the service container; persist; re-render
compose so a future up -d doesn't bring it back.
Both publish decky.<name>.service.added / .removed on the bus, with
the post-mutation services list. Topic constants added to
decnet.bus.topics; the matching wiki entry in wiki-checkout/Service-Bus.md
ships in a separate commit on the wiki repo (wiki-checkout/ is gitignored).
Four new admin endpoints:
* POST/DELETE /api/v1/deckies/{name}/services{,/svc}
* POST/DELETE /api/v1/topologies/{id}/deckies/{name}/services{,/svc}
ServiceMutationError messages are mapped at the API boundary to 404
(decky/topology missing), 409 (idempotency violation), 422 (unknown
or fleet_singleton service).
Topology deploys now plant the configured canary baseline set on every
decky in the topology, mirroring the fleet-deploy hook. Containers are
resolved via resolve_topology_container — <decky>-ssh when the decky
exposes an ssh service, else the topology base container
decnet_t_<id8>_<decky>.
The planter's plant/revoke/seed_baseline grow an optional container=
kwarg; default preserves the fleet <name>-ssh resolution.
