Web UI: runtime console + KV session panel, with runtime/storage libs and tests (#32)

* Add web runtime console and KV sessions

* test(web): cover runtime and KV session behavior

* Fix runtime helper formatting

web/README.md

@@ -16,3 +16,12 @@ Local validation:
 npm test
 npm run build
 ```
+
+The test suite stays browser-light: API requests use a mocked `fetch`, while
+runtime capability and storage behavior are covered through pure helpers. It
+checks that `/health` is resolved next to (not below) the OpenAI `/v1` prefix,
+supports both boolean and numeric `scheduler.active` responses, and sends the
+colibrì-specific `cache_slot` field only when KV-slot support was advertised.
+
+The endpoint and selected model are persisted locally. API keys are intentionally
+memory-only; startup/persistence also removes the legacy `colibri.apiKey` value.