Add overnight flux2klein smoke benchmark runner

optimized/notes/process.md

@@ -7,7 +7,7 @@
 - Do not claim "optimal" when the evidence is still thin; "best current" is acceptable.
 - Prefer removing dead branches, duplicated wiring, and stale custom-node clutter.
 
-## Current weekly review priorities
+## Current review priorities
 
 1. `flux2klein`
 2. `zimage`
@@ -26,7 +26,18 @@
 - `optimized/` = maintained masters
 - `optimized/notes/` = accumulated reasoning and unresolved questions
 
-## What to record after each Sunday review
+## Overnight flow
+
+- `03:00 UK`
+  - optimize maintained workflows where the evidence is strong enough
+  - prefer low-cost `flux2klein` smoke tests first
+  - only submit a test if the ComfyUI queue is idle
+- `06:00 UK`
+  - inspect overnight single-image outputs
+  - update benchmark notes and any affected maintained notes
+  - clear the overnight review-pending state
+
+## What to record after each review
 
 - Which optimized categories changed
 - Which source workflows influenced the update