The picker listed a hard-coded product list and treated any *.json beside sensor.json as a
configuration, so a folder of stray JSON could be offered as a sensor. Discovery now scans the
shipped root and a writable user root beside it, keeps the SDK's verdict for every entry
(listing rejected ones with their reason) and flags duplicate profile_ids instead of shadowing
them; verified by shared/tests and apps/studio/tests.
ykcheungab
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