With no saved platform_toolsets, _toggle_plugin_toolset seeded
platform_toolsets.cli: [<plugin_ts>]. A list naming only plugin keys
replaces the hermes-cli composite, so the model lost every built-in tool
(26 -> 1, no terminal). The seed is dropped: an unknown plugin toolset is
already on by default when no list is saved.
plugins remove now clears the plugin's toolset from saved lists even when
plugin.yaml has no provides_tools (the toggle already no-ops without a
toolset); before, hermes config check warned about an unknown toolset.
Docs: say what provides_tools actually drives.
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