Get a profile

curl -s https://api.betterpost.dev/v1/profiles/prof_1b7r4a9n2d5c8l0e3k6s9m2x \
  -H "x-access-key: $BETTERPOST_API_KEY"

Returns { "success": true, "profile": { ... } } with the same fields as create, or 404 not_found if the profile does not exist in this project (or was deleted).

Reference: GET /v1/profiles/{id}.