The spotify toolset (plugins/spotify) and its loopback-PKCE login (hermes_cli/auth_spotify.py)
now live in NousResearch/hermes-spotify, installed from the plugin catalog. Same pattern as the
Home Assistant move (fb9fc8a3dd): a LEFT_CORE row installs the plugin for every home that was
using it (a Spotify login in auth.json, or the spotify toolset in platform_toolsets) on
`hermes update` / first start; the toolset name, tool names, schemas, env vars and stored login
(providers.spotify) are unchanged, so nobody re-authenticates.
The one user-visible change is the login command: plugins cannot extend `hermes auth`, so the
plugin registers `hermes spotify login|status|logout`. LeftCoreFeature gains a `cli` field and
moved_command_hint() turns `hermes auth [status|logout] spotify`, and `hermes spotify` while the
plugin is not loaded, into a line naming the new command and the install/enable step for this
home. The dashboard's "needs login" hint names the new command too.
Core drops the Spotify auth constants/dispatch, the CONFIGURABLE_TOOLSETS row and post-setup
step, the core `spotify` entries in the shared-metrics toolset enums, its tests, and the docs
(en + zh-Hans) now point at `hermes plugins install spotify` / `hermes spotify login`.
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