fix(open-notebook): the database probe has to be exec-form JSON

podman wraps a bare HealthCmd as CMD-SHELL (measured on Dankclaw's podman 5.7:
--health-cmd "/surreal is-ready" stores {"Test":["CMD-SHELL","/surreal is-ready"]}),
and the pinned SurrealDB v2 image is distroless — no /bin/sh, not even `ls`.
So the probe could never run: every 30 s interval exited 1 in ~30 ms with empty
output while the database was listening and answering, and open-notebook's first
deploy died at the gate ("did not become healthy in 90s"). The hand-check
`podman exec … /surreal is-ready` printed OK, which is why the old comment
believed the probe worked.

The JSON array survives the Quadlet generator (--health-cmd "[\"/surreal\",\"is-ready\"]")
and stores ["CMD","/surreal","is-ready"], which execs directly: a throwaway
instance of the pinned digest went healthy on that form. The seam is re-pinned
to the shell-free contract; the old assertion forbade quotes in any HealthCmd,
which is what pinned the broken shape.

dankclaw/open-notebook/quadlet/open-notebook-surrealdb.container

@@ -48,13 +48,22 @@
 # without `podman unshare` — accepted for a datastore nobody edits by hand;
 # episode AUDIO is a host directory for the opposite reason (see the app unit).
 #
-# HEALTH. The base image is distroless: no shell, no curl, no wget, so no
-# CMD-SHELL probe and no wget/curl probe is possible here (same class of unit
-# as loki, whose probe had to move into the image). SurrealDB ships its own
-# probe instead — `surreal is-ready` connects to ws://localhost:8000 by default
-# and needs no credentials — verified against this digest: it prints `OK` and
-# exits 0 while the server is up. Argument-only HealthCmd, like every unit on
-# this host, because the quadlet generator splits it on spaces.
+# HEALTH. The base image is distroless — measured against this digest, not even
+# `ls` exists (`exec: "ls": executable file not found in $PATH`), so there is no
+# `/bin/sh`, no curl and no wget. SurrealDB ships its own probe instead:
+# `surreal is-ready` connects to ws://localhost:8000 by default, needs no
+# credentials, prints `OK` and exits 0 while the server is up.
+#
+# It must be handed over as a QUADLET-SIDE JSON ARRAY, not a bare command.
+# podman wraps a bare `HealthCmd` string as `CMD-SHELL` (measured on this host's
+# podman 5.7: `--health-cmd "/surreal is-ready"` stores
+# `{"Test":["CMD-SHELL","/surreal is-ready"]}`), and with no `/bin/sh` in the
+# image that probe fails in ~30 ms with empty output on every interval while the
+# database answers perfectly — which is exactly how this service's first deploy
+# died on 2026-10-19 (`did not become healthy in 90s`). The quoted array survives
+# the generator (`--health-cmd "[\"/surreal\",\"is-ready\"]"`) and stores
+# `["CMD","/surreal","is-ready"]`, which execs directly and goes healthy. Do not
+# "simplify" it back to a bare command.
 
 [Unit]
 Description=SurrealDB (open-notebook datastore)
@@ -70,7 +79,7 @@ EnvironmentFile=/home/dank/serverAppConfigs/scripts/open-notebook.env
 EnvironmentFile=/home/dank/Containers/open-notebook/env
 Exec=start --log info rocksdb:/mydata/mydatabase.db
 Volume=open-notebook-db:/mydata
-HealthCmd=/surreal is-ready
+HealthCmd=["/surreal","is-ready"]
 HealthInterval=30s
 HealthTimeout=10s
 HealthRetries=3