Add WEBHOOK and EMAIL to the channel set, the dispatcher cascade, the
per-event default policy, the push-attempt ledger union, and the admin
diagnostic config-presence check. Channels are string-typed, so no
migration is needed. The dispatcher routes each new type through its
sender with the same decrypt + parse + classify path the existing
channels use; the cascade orders webhook + email between the self-host
relays and the Web Push fallback.
Add the webhook + email channel config shapes and their settings-form
validation schemas, plus the query-key entries for the two new config
reads.
The five-thousand-line route registry splits into thirteen domain
modules and the query-key factory into twelve feature files — each
behind an index that preserves exact registration order, proven by a
byte-identical generated contract. The factory lint rule learns the new
home directory.