Relay 0.9 discovers user and system plugins.toml files outside the Hermes
home, so an exporter or middleware can apply to every Hermes session without
any Hermes setting naming it. Hermes now says which files apply.
The startup line that reports an active plugin host lists the files the
activation loaded. `hermes doctor` gains a NeMo Relay Plugins section: it
resolves the same layers through Relay's validator, which loads no plugin
code and leaves the process-wide host alone, then lists each file, whether
anything is enabled, and any error or warning Relay reports. A configuration
Relay would reject counts as a doctor issue. Validation cannot load dynamic
plugins, so a warning marks the row without counting as an issue.
The docs give the user and system file locations for each platform and point
to `hermes doctor`.
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