shareenv: Burn-After-Reading .env Sharing

Why it surfaced

shareenv encrypts secrets in the browser, separates the link from a passphrase, and deletes the payload after it is opened or expires. Its unusually clear threat model includes extension access, link-preview bots, failed-passphrase destruction, and a link to the open-source implementation.

A browser-based tool for sharing encrypted .env files and secrets through expiring, one-time links.