Document atomic schedule promote; sync roster phase to operate

Fleet layer aligned via kaizen-agentic schedule promote --fleet-only.

loops/kaizen-stack/roster.yaml

@@ -1,34 +1,39 @@
-version: "1"
+version: '1'
 loop: kaizen-improvement-stack
 decision: DEC-001 option A (2026-06-18)
-phase: bootstrap
-
-# Repos currently receiving scheduled optimization/coach runs
+phase: operate
 active:
-  - slug: kaizen-agentic
-    root: /home/worsch/kaizen-agentic
-    agents: [coach, optimization]
-    status: active
-    rationale: supplier dogfood
-  - slug: the-custodian
-    root: /home/worsch/the-custodian
-    agents: [coach, optimization]
-    status: active
-    rationale: state-hub coordination operator
-  - slug: activity-core
-    root: /home/worsch/activity-core
-    agents: [coach, optimization]
-    status: active
-    rationale: scheduler owner
-
-# Ordered candidates after pilot — promoted by regulator (ADR-004)
+- slug: kaizen-agentic
+  root: /home/worsch/kaizen-agentic
+  agents:
+  - coach
+  - optimization
+  status: active
+  rationale: supplier dogfood
+- slug: the-custodian
+  root: /home/worsch/the-custodian
+  agents:
+  - coach
+  - optimization
+  status: active
+  rationale: state-hub coordination operator
+- slug: activity-core
+  root: /home/worsch/activity-core
+  agents:
+  - coach
+  - optimization
+  status: active
+  rationale: scheduler owner
 expansion_queue:
-  - slug: reuse-surface
-    agents: [coach, optimization, scope-analyst]
-    domain: helix_forge
-  - slug: vergabe-teilnahme
-    agents: [coach, scope-analyst]
-    domain: coulomb_social
-
-# Repos paused after diminishing-returns detection (ADR-004)
-saturated: []
+- slug: reuse-surface
+  agents:
+  - coach
+  - optimization
+  - scope-analyst
+  domain: helix_forge
+- slug: vergabe-teilnahme
+  agents:
+  - coach
+  - scope-analyst
+  domain: coulomb_social
+saturated: []