Parsed shape of a user-defined Metrics-tab chart. Stored line-oriented
in state.toml as metric.LABEL = "namespace|name|stat[|dim=val;dim=val]".
The fourth pipe-separated field is optional; when absent the app
defaults to the env-scoped EnvironmentName=<env> dimension.
True when no state.toml exists on disk yet. Used by the
first-run nudge to decide whether to surface the “press ? for
help” hint at boot. Distinct from “state.toml exists but is
empty” — the latter means the operator has run ebman before
(we wrote the file) but everything got cleared.