admin-rebake: endpoint + kidlisp-cli/rebake.mjs to refresh oven media
POST /api/admin-rebake fires keep-prepare-background in rebake mode for
any KidLisp piece (minted or not), bypassing the wallet/Tezos checks the
keep-mint flow imposes. Resulting artifactUri/thumbnailUri land in
kidlisp.<code>.pendingRebake. Companion CLI is kidlisp-cli/rebake.mjs;
README documents both it and the existing regenerate-media.mjs.
Use this to recover from broken oven captures (e.g. all-black 528-byte
WebPs from a Puppeteer flake) without walking the keep-mint UI.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>