docs: note installed gate site root

docs/wasm-runtime-architecture.md

@@ -383,13 +383,15 @@ header free-functions are `inline`. The wasm backend exposes only declarations
   source metadata onto wasm produced from an older snapshot.
   `scripts/test_cold_component_deadline.sh` separately compiles a deliberately
   cold component that exceeds the development epoch window and proves the
-  parent request still renders it. The dependency-invalidation gate also holds
-  parent and child compile locks across a transitive source edit, proves a
-  warmed HTTP request returns the last atomically published result without
-  waiting, proves a POST returns a prompt retryable 503 without executing its
-  old mutation handler, and verifies demand-priority convergence. A CLI request
-  still waits and returns only the current dependency result after rebuild
-  completion.
+  parent request still renders it. The focused shell gates create temporary
+  `.uce` units under `UCE_TEST_SITE_DIRECTORY`, or under the installed
+  `SITE_DIRECTORY` from `/etc/uce/settings.cfg` when no override is supplied.
+  The dependency-invalidation gate also holds parent and child compile locks
+  across a transitive source edit, proves a warmed HTTP request returns the
+  last atomically published result without waiting, proves a POST returns a
+  prompt retryable 503 without executing its old mutation handler, and verifies
+  demand-priority convergence. A CLI request still waits and returns only the
+  current dependency result after rebuild completion.
   The component page also calls a parent once without its optional relative
   child and again with that child activated. This guards the component-slot
   cache invariant that a cache hit must restore both the function-table slot