No behavior change. Keeps every touched file and function at or below
its value on main:
- agent/auxiliary_task_config.py: read-time `auxiliary.<task>`
resolution (plugin defaults, inherit_from, whole-route pin); still
re-exported as agent.auxiliary_client._get_auxiliary_task_config.
- hermes_cli/plugins_aux_tasks.py: register_auxiliary_task validation
and entry shape.
- web/src/lib/api-aux.ts: /api/model/auxiliary wire types.
- Desktop: aux row list, label resolver, deep-link highlight, route
summary, Follow button and the set-to-main route in
settings/aux-task-rows.tsx; one assignAuxiliary callback replaces
setAuxiliaryToMain. Built-in aux slot labels move from each locale
into <locale>_aux_tasks.ts (types_aux_tasks.ts holds the shape).
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