chore: commit work in progress before registrar reconciliation

Authorised as part of the CUST-WP-0068 identity cleanup. The registrar requires
a clean worktree, and these changes were already present in the checkout.

Refs CUST-WP-0068

Assistant: claude-code
Assistant-Model: opus
Assistant-Process: 2583210@bnt-lap001
Assistant-Session: f2bff2d5-e9b2-4338-92ca-10282a927006

SCOPE.md

@@ -19,6 +19,8 @@ coordination-engine captures coordination models, specs, and registry entries fo
 ## In Scope
 
 - Coordination specs, history, and registry indexes
+- Headless coordination runtime, including cross-repository worker coordination
+  (observation, leases, wake-up, checkpoints, safety gates, and receipts)
 - State Hub workplans and agent instructions
 - Capability registration when coordination patterns stabilize
 
@@ -26,6 +28,6 @@ coordination-engine captures coordination models, specs, and registry entries fo
 
 ## Out of Scope
 
-- Runtime orchestration engine implementation (future repos)
+- Replacing the systems coordinated through adapters (issue trackers, chat,
+  workflow, notification, delivery, or evidence systems)
 - Replacing issue trackers or chat systems
-