The switch reports every change as an event (LP-8)

Turning legacy mail protocols off or back on raises
security.legacy-protocols-changed (id 643, info level, also in the packaged
schema), with the scope (policy = server), the new value, who made the
change (accountId), whether listeners closed or reopened (details), which
ones (listenerId), and -- only when a listener could not be put back --
which and why (reason).

It is raised in Server::set_protocol_policy rather than by the JMAP
method, so whatever turns the switch is reported. A /set that changes
nothing -- the switch already where it was asked to be, nothing to close
or reopen -- is not a change and raises nothing.

The event is never an error, but jmap's exhaustive map from security
events to HTTP errors has to name it; it joins the other two that can't
occur there. rustfmt now also wraps LP-6's two over-long lines in
enums_impl.rs, which it flagged along with this change's.

tests/e2e/legacy_protocols.py now gives the server a stdout tracer and
reads events from the container's log: turning the switch off is exactly
one event naming the scope, value, author and listeners closed; setting it
off again raises none; turning it on is one event naming the listeners
reopened. It also proves LP-6's side: seven refused submission sign-ins
are seven auth.legacy-protocol-refused events, and there is no auth.failed
or auth.too-many-attempts among them. All checks pass.

crates/jmap/src/api/mod.rs

@@ -2,6 +2,8 @@
  * SPDX-FileCopyrightText: 2020 Stalwart Labs LLC <[email protected]>
  *
  * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-SEL
+ *
+ * Modified by Coffey Labs in 2026 for INBUXA.
  */
 
 use crate::blob::UploadResponse;
@@ -186,7 +188,10 @@ impl ToRequestError for trc::Error {
                 trc::SecurityEvent::Unauthorized | trc::SecurityEvent::IpUnauthorized => {
                     RequestError::forbidden()
                 }
-                trc::SecurityEvent::IpBlockExpired | trc::SecurityEvent::IpAllowExpired => {
+                // inbuxa: legacy-protocols LP-8 is an event, never an error
+                trc::SecurityEvent::IpBlockExpired
+                | trc::SecurityEvent::IpAllowExpired
+                | trc::SecurityEvent::LegacyProtocolsChanged => {
                     RequestError::internal_server_error()
                 }
             },