The shared Cloud deployment runs one Plugin Runtime for every Workspace, but
nothing reported its health: the instance only exposed two aggregate numbers on
its own health probe, and the per-installation failure registry, the desired
state registry and the reconcile outcome lived in memory with no reader.
Add RuntimeOpsReporter, which every 30 seconds reads the Runtime ``/healthz``
probe over HTTP (derived from ``plugin.runtime_ws_url``), merges it with the
connector's desired-state, failure and reconcile summaries, and posts one
sample to the Space control plane on the existing authenticated direction.
Delivery is best-effort and bounded: a single in-flight request, a ten second
timeout, dropped samples counted in ``runtime_ops`` on the instance health
probe, and a failed probe recorded as a drop so the dashboard shows staleness
instead of grading a stale sample as healthy.
Cloud-only: a non-cloud deployment never enables the reporter, and the channel
is independent of product telemetry so ``space.disable_telemetry`` cannot blind
the ops dashboard.
