docs: document package KV cache effects

packages/sdk/scripts/README.md

@@ -25,6 +25,8 @@ The root library exports `startSDK`, `runSDK`, and the `SdkBootArgs`/`SdkBootCon
 
 Indirectly, through the project `cordis.yml` tree loaded by `start` or `dev`.
 
+**KV Cache effect**: No direct invalidation; the named consumer owns any request-prefix changes.
+
 ## Known Limitations and Deferred Work
 
 - **Launcher arguments are schema-free** — `start` and `dev` preserve Node `parseArgs()` output rather than validating project-specific flags.