docs: document package KV cache effects

packages/sdk/create-sdk/README.md

@@ -14,6 +14,8 @@ The provider choice is DeepSeek or a custom endpoint backed by `llm-pi-ai`. Deep
 
 Indirectly, through the generated project composition and its selected runtime plugins.
 
+**KV Cache effect**: No direct invalidation; the named consumer owns any request-prefix changes.
+
 ## Known Limitations and Deferred Work
 
 - **TTY-only creation** — flags prefill questions, but the wizard still requires an interactive terminal before it writes a project.

packages/sdk/helper/README.md

@@ -18,6 +18,8 @@ The package root explicitly exports only the objects consumed by `create-sdk` an
 
 None, as the project domain edits files and never mounts a live agent or model request.
 
+**KV Cache effect**: None; this package neither assembles nor sends a provider request.
+
 ## Known Limitations and Deferred Work
 
 - **Commit is not transactional across files** — external edits are detected before each write, but a later failure does not roll back files already written.

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.