HTTP boundry

docs/CURRENT_SYSTEM_ARCHITECTURE.md

@@ -34,7 +34,8 @@ Primary source areas:
 - `src/runtime/shader`: background Slang build bridge and prepared shader artifact types
 - `src/runtime/state`: runtime JSON helpers, parameter normalization, and debounced runtime-state persistence
 - `src/runtime/text`: MSDF/MTSDF font atlas build and CPU-side prepared text texture composition
-- `src/control`: HTTP routing, command parsing, OpenAPI state JSON
+- `src/control`: command parsing, HTTP/WebSocket transport helpers, OpenAPI state JSON
+- `src/app/RenderCadenceHttpRoutes.*`: this app's current HTTP endpoint map
 - `src/preview`: optional non-consuming preview window
 - `src/telemetry` and `src/logging`: runtime observation and logging
 
@@ -149,7 +150,7 @@ Screenshot routes are present in the UI/OpenAPI surface but are not implemented
 
 ## Control Surface
 
-The HTTP server runs on its own thread. It serves:
+The HTTP server runs on its own thread. `HttpControlServer` owns socket lifetime, HTTP parsing, static asset helpers, OpenAPI/Swagger helper serving, and WebSocket state transport. `RenderCadenceHttpRoutes` owns this app's current endpoint map:
 
 - UI assets
 - OpenAPI/Swagger docs
@@ -167,6 +168,8 @@ Known but not implemented in the current native command path:
 
 Unsupported routes return an action response with `ok: false`.
 
+Forks can reuse the HTTP/WebSocket shell without keeping these endpoints by installing a different route callback.
+
 ## Tests
 
 Native tests cover the main non-GL contracts:
@@ -177,7 +180,7 @@ Native tests cover the main non-GL contracts:
 - supported shader catalog
 - runtime layer restore/reload behavior
 - runtime-state persistence writer
-- HTTP command parsing
+- HTTP transport and app-route dispatch
 - frame exchange and input mailbox behavior
 - video format and scheduling helpers