fix(WP-0009): use workstream status 'blocked' not task status 'wait'

'wait' is a task-level status; valid workstream/workplan frontmatter statuses
are proposed/ready/active/blocked/backlog/finished/archived. The mislabeled
'wait' caused fix-consistency C-04 to 422 when syncing the workstream status.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

workplans/WARDEN-WP-0009-flex-auth-policy-gate-production.md

@@ -4,7 +4,7 @@ type: workplan
 title: "flex-auth Policy Gate Production Readiness"
 domain: custodian
 repo: ops-warden
-status: wait
+status: blocked
 owner: codex
 topic_slug: custodian
 planning_priority: low