Update documentation for AGENTS.md, CHAT_CONTEXT.md, architecture.md, and testing.md with new time-related features and direction.

CHAT_CONTEXT.md

@@ -29,6 +29,8 @@ Broadly implemented already:
 - multi-viewport editor foundations
 - unified creation/placement foundations
 - transform foundations
+- project-wide time foundation with a running global clock
+- first day/night lighting override tied to project time
 
 Important consequence:
 
@@ -74,6 +76,8 @@ Treat current box-brush structures as the starting point for whitebox solids unl
 - world settings own global background / ambient / sun / fog
 - local authored lights stay in typed entities
 - project save/load and runner export are separate concerns
+- project time is global, not per scene
+- current day/night logic exists, but it is still a small dedicated driver rather than a generic schedule system
 
 Imported model collision:
 
@@ -133,6 +137,8 @@ The next large topics are more likely to be things like:
 - whitebox-solid editing model
 - multi-scene / project structure
 - richer runtime systems
+- authored day/night refinement on top of project-global time
+- later deterministic schedule/routine/event systems driven by global time + flags + scene context
 - remaining packaging / portability work
 - future primitives and topology tools after the whitebox direction is coherent