v0.11.5

Critical dispatch pipeline fix.

Fixes

• Engineers no longer stall in Working state with no active task —
  When mark_member_working() fires but task delivery subsequently fails,
  the engineer gets stuck in Working with no active_tasks entry, blocking
  all future dispatch. The dispatch queue now detects this inconsistency
  and force-transitions the engineer to Idle before the delivery gate.
  (src/team/dispatch/queue.rs)