23: Keep the registrations behind a duplicate slug

[nikolaystrikhar]

What: Registry\Reader::flush() offers every buffered registration to the registrar and rethrows the first duplicate-slug Config_Exception after the loop, instead of letting the first one end it.

Usage:

Absorber::register( $give_recurring );
Absorber::register( $duplicate_slug ); // still reported
Absorber::register( $give_fee_recovery ); // and this one still loads

Why this way:

The buffer is emptied before the loop, which is what made the throw lossy. That emptying is deliberate — it stops a second read re-registering what the registrar already holds — but it meant a collision left everything behind it in no registrar and in no buffer. A host got a report naming the two that collided and silently lost the rest, for the rest of the process, on both passes.

The collision still has to surface, so it is rethrown rather than swallowed. Both passes already catch Config_Exception around the read; this only changes what else survives the trip.

The first collision, not the last, so a buffer holding two of them keeps naming the one the host wrote first until it is fixed.

[d4mation]

Nice! Ideally this should be fixed in a Host plugin before exactly when the Exception was thrown actually mattered, but this is still a good change.