v0.12.26: send to my vault from any browser

The feature request in Sixteen notes I did not want to lose (049). Every account can have an inbox: an append lane on the reader vault that any browser can write to and none can read, and a key pair made in the reader's browser, the private half kept in the master. The Vault tab makes the link and shows it three ways, a URL, text and a QR code, carrying where to write and the key to encrypt to, nothing else. A browser with no passkey opens it (vault/send.html), seals what it holds to that key and appends it; from then on the strip above the pane offers Send to my vault on any page. The next time the vault is opened with the passkey, the Vault tab lists what is waiting, from which browser and what it carries, refuses what is sealed to another key, changed on the way or not an inbox message, and brings the rest in on one press, with the sending browser as its author. Make a new link stops the old one.

Not built: expiry (the append routes have none to enforce it), signatures, purge, and the reply lane (015), which can use the same machinery. The design is admin/notes/2026-10-13__send-to-my-vault-from-any-browser.md. CI runs thirteen test files.