fix(deploy): grafana copier provisions EVERY dashboard json, not a hand-listed subset

copy_grafana_provisioning named llm-fleet.json alone, so a new board in
shared/grafana/provisioning/dashboards/ silently never reached
/opt/grafana/provisioning. Measured 2026-10-21: the containers board was
merged, seam-tested, and documented as working since 2026-10-20, yet was
NEVER provisioned — its panel fixes were undeployable; the other four
boards existed on disk only because someone hand-copied them once (and
host-system.json there had gone stale against the repo). The copier now
globs the directory, and GRAFANA_PROV_ROOT lets the new bats case run
the copier for real into a sandbox (red against the old hand-listed
body, green against the glob). Vault: the copier law + the containers
incident on Observability Provisioning, the corrected dashboards claim
on Observability.

Note: a mktemp sandbox + trap RETURN races bats' trap machinery (the
dir vanishes mid-function); BATS_TEST_TMPDIR is the safe idiom.

scripts/deploy-remote.sh

@@ -321,14 +321,25 @@ copy_grafana_provisioning() {
     # datasource would be invisible to review, lost with the data volume, and
     # unknown to anyone reading the repository. The unit already mounts
     # /opt/grafana/provisioning read-only, so this only has to populate it.
-    run_privileged mkdir -p /opt/grafana/provisioning/datasources \
-        /opt/grafana/provisioning/dashboards
+    # GRAFANA_PROV_ROOT is the test seam: point it at a sandbox and the whole
+    # copy runs unprivileged (the bats case executes this function for real).
+    local root="${GRAFANA_PROV_ROOT:-/opt/grafana}"
+    run_privileged mkdir -p "$root/provisioning/datasources" \
+        "$root/provisioning/dashboards"
     run_privileged cp shared/grafana/provisioning/datasources/prometheus.yml \
-        /opt/grafana/provisioning/datasources/prometheus.yml
+        "$root/provisioning/datasources/prometheus.yml"
     run_privileged cp shared/grafana/provisioning/dashboards/provider.yml \
-        /opt/grafana/provisioning/dashboards/provider.yml
-    run_privileged cp shared/grafana/provisioning/dashboards/llm-fleet.json \
-        /opt/grafana/provisioning/dashboards/llm-fleet.json
+        "$root/provisioning/dashboards/provider.yml"
+    # EVERY dashboard JSON rides, not a hand-listed subset: the fleet provider
+    # turns each file in the directory into a dashboard, so a copier that names
+    # files one by one silently drops new boards (measured 2026-10-21: the
+    # containers board existed in the repo since its commit and was NEVER
+    # provisioned — the panel-census browser check could not find it while the
+    # hand-placed older boards happened to be on disk). Same rule as the quadlet
+    # tier: the directory is the contract, the copy is generated state.
+    for dash in shared/grafana/provisioning/dashboards/*.json; do
+        run_privileged cp "$dash" "$root/provisioning/dashboards/$(basename "$dash")"
+    done
 }
 
 render_caddyfile() {