mosaic console start --dev-local-owner --dev-insecure-bind ADDR
--dev-allow-host NAME[,NAME...] binds 0.0.0.0 or an IPv4 address and
answers only NAME:<bound port> plus the loopback names. Both flags are
refused without the dev owner, the bind without an allowed name, and a
specific ADDR that is not itself a name. Start and console status print
the no-sign-in warning; the state file records bind and allowHosts.
serve.mjs takes devAllowHosts only with the dev owner; SSO, preview and
tester listeners stay loopback. Writes need Origin http://<same Host>.
Chromium sends no Fetch Metadata from a LAN http origin, so for an
allowed name a write with that exact Origin and no Sec-Fetch-Site counts
as same-origin; an explicit header is still judged by the routes.
chat.js builds its operation keys without crypto.randomUUID, which an
insecure context lacks.
