end point adjsutments

apps/RenderCadenceCompositor/README.md

@@ -44,6 +44,7 @@ Included now:
 - app-owned submission of a completed shader artifact
 - render-thread-only GL commit once the artifact is ready
 - manifest-driven stateless single-pass shader packages
+- HTTP shader list populated from supported stateless single-pass shader packages
 - default float, vec2, color, boolean, enum, and trigger parameters
 - small JSON writer for future HTTP/WebSocket payloads
 - JSON serialization for cadence telemetry snapshots
@@ -145,7 +146,7 @@ The app starts a local HTTP control server on `http://127.0.0.1:8080` by default
 Current endpoints:
 
 - `GET /` and UI asset paths: serve the bundled control UI from `ui/dist`
-- `GET /api/state`: returns an OpenAPI-shaped state scaffold with cadence telemetry under `performance.cadence`
+- `GET /api/state`: returns OpenAPI-shaped display data with cadence telemetry, supported shaders, output status, and a read-only current runtime layer
 - `GET /docs/openapi.yaml` and `GET /openapi.yaml`: serves the OpenAPI document
 - `GET /docs`: serves Swagger UI
 - OpenAPI POST routes are present but return `{ "ok": false, "error": "Endpoint is not implemented in RenderCadenceCompositor yet." }`
@@ -205,6 +206,10 @@ Current runtime shader support is deliberately limited to stateless single-pass
 - manifest defaults are used for parameters
 - `gVideoInput` and `gLayerInput` are bound to a small fallback source texture until DeckLink input is added
 
+The `/api/state` shader list uses the same support rules as runtime shader compilation and reports only packages this app can run today. Unsupported manifest feature sets such as multipass, temporal, feedback, texture-backed, font-backed, or text-parameter shaders are hidden from the control UI for now.
+
+The current runtime shader is also exposed as a read-only display layer with manifest parameter defaults. POST control endpoints still intentionally return "not implemented" responses until the control/state ownership model is ported.
+
 Successful handoff signs:
 
 - telemetry shows `shaderCommitted=1`