ToolsetConfigPanel threads its profile scope into every fetch but rendered
VoiceProviderFields without it, and the fields were hard-wired unscoped —
configuring profile B's TTS from the Capabilities selector read and
autosaved profile A's whole config record. New capability-scoped
saveHermesConfigRecord (symmetric with getHermesConfigRecord), profile
prop threaded through, per-scope cache write-through. Unscoped callers
(Settings → Voice) unchanged.
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