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feat: add docker healthcheck - #11
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The runtime image is distroless, so it has no shell, curl or wget to probe with. Add a `lens healthcheck` subcommand that GETs /api/health on the configured PORT over a raw loopback socket (3s timeout) and exits non-zero unless the response is 200. The Dockerfile HEALTHCHECK invokes it directly, so `docker ps` and compose show container health.
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The runtime image is distroless, so it has no shell, curl or wget to probe with. Add a
lens healthchecksubcommand that GETs /api/health on the configured PORT over a raw loopback socket (3s timeout) and exits non-zero unless the response is 200. The Dockerfile HEALTHCHECK invokes it directly, sodocker psand compose show container health.