The anonymous trial is now preview-only. screenci edit works without a
SCREENCI_SECRET: the anon session token doubles as the dev token, and a
claimed trial self-upgrades in place (the claim-minted org secret and
personal editor token are persisted into .env and the bridge reconnects
without stopping). Expired or claimed-elsewhere sessions get clear
next steps.
screenci export now refuses the anonymous trial up front and points at
edit for the free live preview and at sign-up for exporting; a claimed
trial self-upgrades to the real secret and proceeds.
Docs and the agent skill are updated to match.