HERMES_PREVIEW_FULL_CONNECTORS=true|false makes the free-tier mint send
{"preview_full_connectors": <bool>} in the /api/anonymous/create body, so
the account service can record the cohort on the account and gate
toolkits from it. Any other value (unset included) keeps the body {}.
The variable joins the desktop bundle-env allowlist (release script,
banner writer, channel request decoder, BUILDING.md) so a bundle can
bake it in. It is self-reported and visible in the packaged JS: the
service must treat it as a preference, not proof.
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