Clean up pass

docs/RENDER_CADENCE_GOLDEN_RULES.md

@@ -26,6 +26,7 @@ Not allowed on the render thread:
 - network/API/OSC handling
 - DeckLink scheduling
 - blocking console logging
+- config file discovery or parsing
 
 If future GL preparation needs to happen off-thread, use an explicit shared-context GL prepare thread. Do not smuggle non-render work back into the cadence loop.
 
@@ -127,6 +128,10 @@ Preferred boundaries:
 - system-memory frame exchange
 - DeckLink output scheduling
 - telemetry
+- local control/API edge
+- config loading
+- JSON presentation/serialization
+- logging
 
 If a file starts coordinating multiple subsystems and doing detailed work for each of them, split it before it becomes the new old app.