## Summary
Allow each organization member to use the same development branch name
without colliding with another member's environment. Fixes#4320.
## Fix
Development branches now use the existing member-scoped project, slug,
and organization-member key for upserts. Preview branches retain their
project-wide shortcode behavior.
New development branches receive distinct shortcodes while keeping their
readable, member-scoped slugs. Existing branches continue to resolve
through the member-scoped key, so this requires no migration or
backfill.
Chris Arderne
bb34a2e224