/api/events sent every daemon event to every open page. Event::redacted
strips the query and the password from addresses, not the path, so a
paid feed's key in its path (feeds.supercast.com/feeds/<key>) reached
everyone signed in through its FeedError or FeedMoved (#325). And the
stream checked who was asking once, when it opened: a removed account's
page kept getting events until it closed (#335).
Each stream now looks its account and subscriptions up again at most
every 30 s, as an event arrives, ends when the account is gone, and
sends an event about a feed only to someone subscribed to it. Admins
get everything, for the log; Reaped, a file path, goes to admins only;
SignalHits to the person it is for.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>